Big Green Egg Half Moon Cast Iron Grid

Cast iron half moon searing grid for Big Green Egg Large and XL models. Dual-sided design with narrow ridged surface for grill marks and wide flat surface for delicate foods like fish and seafood. Preseasoned and ready to use. Superior heat retention for perfect sears. Works with standard grids and EGGspander systems. On display at our Wetherill Park showroom.

The Half Moon Cast Iron Grid transforms your Big Green Egg into a dedicated searing station. This heavy-duty grid sits alongside your standard stainless steel cooking grid, giving you the option to sear steaks on cast iron while grilling vegetables on stainless steel during the same cook.

The half moon shape covers half the cooking area, leaving the other half available for standard grilling. This configuration allows you to run two cooking methods simultaneously. Sear a thick ribeye on the cast iron side while roasting peppers on the stainless grid side. The separation prevents cross-contamination of flavours and gives you direct control over each cooking zone.

Available in two sizes to match your EGG. The Large grid fits the Large EGG. The XL grid fits the XL EGG. Two half moon grids can be combined to create a full round cast iron cooking surface if you want wall-to-wall cast iron heat retention.

We stock both sizes at our Wetherill Park showroom where you can see them fitted to demonstration EGGs alongside the full Big Green Egg accessory range.

Key Features

Dual-Sided Searing Surface

The Half Moon Cast Iron Grid features two distinct cooking surfaces on opposite sides. One side has narrow raised ridges. The other side has wide flat ridges.

The narrow ridged side creates defined sear marks on steaks, chops, and burgers. The raised ridges contact the meat at specific points, creating the classic crosshatch grill pattern. Fat renders through the gaps between ridges, preventing steaming and ensuring proper crust formation.

The wide flat ridge side provides more surface contact for delicate proteins and vegetables. Fish fillets, prawns, and thinly sliced vegetables benefit from the additional support. The wider contact area prevents small items from falling through while still allowing fat drainage.

Simply flip the grid to switch between searing styles. The narrow side handles thick cuts that need aggressive marking. The wide side manages thin proteins and chopped vegetables that require stable support during cooking.

Both surfaces retain the seasoning that builds up over repeated use. The seasoning creates a natural non-stick layer that improves with each cook. Unlike coated pans that degrade, cast iron seasoning becomes more effective as the grid ages.

Superior Heat Retention

Cast iron absorbs and holds significantly more heat than stainless steel. When preheated properly, the Half Moon Grid maintains stable surface temperature even when cold food makes contact.

This heat retention creates proper searing conditions. Place a cold steak on the preheated grid and the surface temperature recovers quickly. The sustained heat drives moisture from the meat surface, allowing the Maillard reaction to proceed without interruption. The result is a dark, flavourful crust with minimal moisture loss from the interior.

The thermal mass also enables reverse searing. Cook meat low and slow using indirect heat until it reaches target internal temperature, then finish with a quick sear on the preheated cast iron grid. The stored heat creates instant crust formation without overcooking the interior.

Heat distribution across the grid remains even due to cast iron's conductive properties. Hot spots that occur with thin stainless grids are eliminated. Every section of the Half Moon Grid delivers consistent searing performance.

Temperature recovery speed matters during high-volume cooking. The grid maintains searing capability across multiple steaks without temperature drop between placements. The heavy construction stores enough thermal energy to handle back-to-back sears without rest periods.

Preseasoned and Ready to Use

The Half Moon Cast Iron Grid arrives preseasoned from Big Green Egg. The factory seasoning creates an initial protective layer that prevents rust and provides basic non-stick properties. You can begin cooking immediately without additional seasoning preparation.

The preseasoning uses food-safe oils baked into the iron surface at high temperature. This process polymerises the oil, creating a hard, durable coating bonded to the metal. The coating resists chipping and peeling under normal use.

With each cook, additional layers of seasoning build on top of the factory coating. Fats from meat and cooking oils fill microscopic pores in the iron surface. Over time, these layers create a smooth, jet-black finish with excellent release properties.

Maintaining the seasoning requires minimal effort. After cooking, brush the grid clean while still warm and apply a light coat of cooking oil before the grid cools completely. This simple maintenance preserves the protective layer and prevents rust formation during storage.

The seasoned surface improves flavour transfer between cooks. Trace amounts of previous cooks remain in the seasoning, adding complexity to subsequent meals. This flavour development is unique to cast iron and cannot be replicated with other cooking surface materials.

Works with EGGspander and Standard Setups

The Half Moon Cast Iron Grid integrates with both standard Big Green Egg configurations and EGGspander multi-level systems. In standard setups, place the grid directly on the fire ring alongside your existing stainless steel grid. The half moon shape allows both grids to coexist, giving you cast iron and stainless cooking surfaces during the same session.

For EGGspander users, the Half Moon Grid fits on any EGGspander level. Combine it with other half moon accessories like the Plancha Griddle or Baking Stone to create custom cooking configurations. Run the cast iron grid on the lower level for searing while a vegetable basket cooks on the upper level.

The grid works with or without the ConvEGGtor. For direct high-heat searing, place the grid over open coals. For gentler cooking, use the ConvEGGtor to create indirect heat and position the grid above it. This flexibility lets you use the same grid for both aggressive searing and moderate-temperature cooking.

Two half moon grids can replace your full round stainless grid entirely if you want complete cast iron coverage. Purchase two grids and arrange them to create a full circle cooking surface. This configuration maximises heat retention across the entire cooking area.

Specifications

• Material - Cast iron
• Finish - Preseasoned
• Design - Dual-sided (narrow ridges / wide ridges)
• Shape - Half moon
• Compatibility (Large) - Big Green Egg Large
• Compatibility (XL) - Big Green Egg XL
• EGGspander Compatible - Yes
• ConvEGGtor Compatible - Yes

What's Included

• 1 x Half Moon Cast Iron Grid (size specific to Large or XL EGG)

How to Use

Preheating for Optimal Searing

Set up your EGG for direct high heat. Fill the firebox with Big Green Egg lump charcoal and light using your preferred method. Open bottom and top vents fully to achieve maximum airflow.

Place the Half Moon Cast Iron Grid on the fire ring once coals are fully ignited. Close the dome and allow the grid to preheat for 15 to 20 minutes. Cast iron requires longer preheat times than stainless steel due to its thermal mass.

Monitor dome temperature using your EGG thermometer. For steaks and chops, target 230 to 260 degrees Celsius. The grid surface will be significantly hotter than dome temperature due to its proximity to the coals.

Test grid readiness by flicking water droplets onto the surface. Properly preheated cast iron will cause water to bead and dance across the surface rather than immediately evaporate. This indicates the grid has reached optimal searing temperature.

Do not place food on the grid before preheating is complete. Insufficient preheat results in sticking and prevents proper crust formation.

Searing Steaks and Chops

Pat meat dry with paper towels before placing on the grid. Surface moisture must evaporate before browning can begin. Dry meat sears immediately. Wet meat steams.

Place steaks on the preheated grid using tongs. You should hear an immediate sizzle. If you do not hear sizzling, the grid temperature is too low. Remove the meat and continue preheating.

Leave meat undisturbed for 2 to 4 minutes depending on thickness. Movement interrupts crust formation. The meat will release naturally from the grid when the crust has fully developed. If the meat sticks when you attempt to flip, allow another 30 seconds before trying again.

Rotate steaks 90 degrees halfway through each side to create crosshatch grill marks. This is aesthetic only and does not affect cooking performance, but the marks indicate proper searing technique.

For thick cuts requiring lower internal temperatures, use the reverse sear method. Cook the meat indirectly with the ConvEGGtor until it reaches 10 degrees below target temperature, then transfer to the preheated cast iron grid for final searing. This technique delivers edge-to-edge even cooking with a dark exterior crust.

Cooking Delicate Foods on the Flat Side

Flip the grid to expose the wide flat ridge side when cooking fish, prawns, or thinly sliced vegetables. The broader surface contact provides more support for foods that would otherwise fall apart or slip through gaps.

Preheat the grid following the same process used for searing, but reduce target temperature to 180 to 200 degrees Celsius for delicate proteins. Lower heat prevents fish from overcooking while still creating a light crust.

Oil the grid lightly before placing fish fillets. While the seasoning provides some release properties, delicate fish benefits from additional lubrication. Use a high smoke point oil like avocado or rice bran oil.

Fish is ready to flip when it releases cleanly from the grid. Delicate fillets will stick initially but release naturally once the surface proteins coagulate. Forced flipping tears the fillet and ruins presentation.

Vegetables like zucchini, capsicum, and onion slices cook well on the flat side. The consistent contact creates even caramelisation without the aggressive char that occurs on the narrow ridged side.

Using with EGGspander Multi-Level Cooking

Install the EGGspander system in your EGG according to manufacturer instructions. The Half Moon Grid sits on any EGGspander rack height.

Common configurations combine the cast iron grid on the lower rack with vegetables or bread on the upper rack. The lower position receives more direct heat, making it ideal for searing. The upper position provides gentler cooking suitable for items that require less aggressive heat.

Mix and match half moon accessories to create custom setups. Pair the Cast Iron Grid with a Half Moon Plancha Griddle to run two different cooking surfaces simultaneously. Sear steaks on cast iron while cooking eggs and bacon on the plancha.

The spacing between EGGspander levels allows smoke circulation even when both levels are occupied. This ensures foods on upper racks receive smoke exposure despite being further from the fire.

Care and Maintenance

Clean the grid while still warm after each use. Heat makes residue removal easier and prevents buildup from hardening overnight. Use a stiff grill brush or scraper to remove stuck-on food particles. Work along the ridge direction rather than across it to avoid damaging the seasoning.

Do not use soap or detergent on the grid. Soap strips the seasoning layer and exposes bare iron to oxidation. Water and mechanical scrubbing are sufficient for routine cleaning.

For stubborn residue, heat the grid on the EGG until the stuck material carbonises, then brush clean. This self-cleaning method works for heavily soiled grids without damaging the seasoning.

After cleaning, apply a thin coat of cooking oil to the entire grid surface while it remains warm. Use a paper towel to spread the oil evenly across all surfaces including edges. The warm iron absorbs the oil, reinforcing the protective seasoning layer.

Allow the grid to cool completely before storing. Store in a dry location where air can circulate around it. Avoid sealing cast iron in plastic bags or airtight containers as trapped moisture promotes rust.

Inspect the grid periodically for rust spots. Minor surface rust is cosmetic and easily removed. Scrub rust spots with steel wool, then reseason the affected area by heating and oiling. Deep rust that pits the iron requires full restoration involving stripping and complete reseasoning.

The grid will darken over time as seasoning layers accumulate. This darkening indicates healthy seasoning development. A well-maintained grid becomes nearly black with smooth, glass-like surface texture.

Frequently Asked Questions

Which size Half Moon Cast Iron Grid do I need?

Grid sizing matches your EGG model exactly. If you own a Large EGG, purchase the Large Half Moon Cast Iron Grid. If you own an XL EGG, purchase the XL Half Moon Cast Iron Grid. The grids are not interchangeable between sizes. Using an incorrectly sized grid results in poor fit and creates gaps that allow temperature loss.

Can I use this instead of my stainless steel cooking grid?

Yes. You can replace your stainless grid entirely by purchasing two Half Moon Cast Iron Grids and arranging them to form a complete circle. This gives you full cast iron coverage across the entire cooking surface. The trade-off is increased weight and maintenance requirements compared to stainless steel, but you gain superior heat retention and searing performance.

Do I need to season the grid before first use?

No. The grid arrives preseasoned from Big Green Egg and is ready to cook on immediately. However, the factory seasoning is minimal. The grid will perform better after several cooking sessions as additional seasoning layers develop. For best results, cook fatty foods like burgers or sausages during the first few uses to accelerate seasoning buildup.

How do I prevent food from sticking?

Proper preheating is the primary factor in preventing sticking. A correctly preheated grid creates immediate searing that forms a crust. The crust releases naturally when fully developed. Additionally, ensure food surface is dry before placement, and avoid moving food before the crust forms. Oil the grid lightly before cooking delicate items like fish.

Can I leave the grid in the EGG between cooks?

Yes, but this is not recommended for long-term storage. Leaving the grid in the EGG exposes it to temperature fluctuations and moisture from rain if your EGG is outdoors. The seasoning can degrade, and rust may form. Remove the grid after cooking, clean it, oil it, and store it in a dry indoor location for best longevity.

Why is my grid developing rust spots?

Rust forms when bare iron is exposed to moisture and oxygen. This happens when seasoning is damaged or when the grid is stored in humid conditions without proper oiling. Prevent rust by maintaining the seasoning layer through regular oiling after each use, storing the grid in a dry location, and avoiding prolonged exposure to moisture. Minor rust is cosmetic and easily remedied by scrubbing and reseasoning.

Can I see the Half Moon Cast Iron Grid in person before buying?

Yes. They're available to view and purchase at our BBQ showroom in Wetherill Park, where you can also see the full range of Big Green Egg fuel and accessories and get advice on lighting your egg or charcoal BBQ.