La Cornue Grill Module and Lava
La Cornue Grill Module and Lava is a common question among La Cornue owners. This guide walks through it step by step with technician-grade detail.
The La Cornue grill module uses gas-heated lava rocks to deliver high, even searing heat and a touch of char. Like any grill, it needs regular cleaning and rock maintenance to perform well and avoid clogging or flare-ups. This guide explains the routine.
How the lava-rock grill works
A gas burner heats a bed of lava rocks, which radiate heat upward to the grill grate. Drippings vaporize on the hot rocks, adding grilled flavor. Over time the rocks accumulate grease and food debris that can clog them, cause flare-ups, and create off-flavors.
After each use
- Let the grill cool, then brush the grate to remove food residue.
- Wipe the grate and surrounding area to prevent grease buildup.
- Empty and clean any drip tray to avoid grease pooling.
Lava-rock maintenance
- Burn-off: Periodically run the grill burner hot with the grate removed to burn off grease on the rocks.
- Turn the rocks: Some owners flip the rocks occasionally so the greasy side faces down and burns clean.
- Replace when needed: Lava rocks degrade and crumble over time; when they break down or stay greasy despite burn-off, replace them.
Preventing flare-ups
Excess grease on the rocks is the main cause of flare-ups. Keep the rocks clean, trim excess fat from food, and avoid overloading the grill. A drip tray that is emptied regularly also reduces flare risk.
Checking the burner and igniter
If the grill won’t light or burns unevenly, the burner ports or igniter may be clogged or fouled. Clear the igniter port and burner ports as you would for a standard burner — see our clicking igniter guide and the range won’t light checklist.
Reference and service
Grill-module specifications and replacement rock guidance are on lacornueusa.com. If the grill burner or valve needs service, schedule a technician.
When to replace the lava rocks
Lava rocks are consumables, not permanent hardware. They degrade with heat cycling and accumulated grease: replace them when they crumble, break apart, or stay greasy and smoky even after a hot burn-off. Worn rocks heat unevenly and cause more flare-ups, so swapping them is part of normal upkeep rather than a repair. Arrange fresh rocks in an even, single layer so heat reaches the grate uniformly — piling them unevenly creates hot and cold spots.
Don’t neglect the drip tray and burner
Grease that pools in the drip tray is a flare-up and odor source, so empty and clean it regularly. If the grill is slow to light or burns unevenly, the burner ports or igniter may be fouled — clear them as you would any burner, following our clicking igniter guide. Keeping the burner clean is what lets the rocks heat evenly in the first place.
Frequently asked
- Can I wash lava rocks? Don’t soak them; burn off grease by running the burner hot with the grate removed, and flip them so the greasy side burns clean.
- Why so many flare-ups? Usually excess grease on the rocks — trim fat, avoid overloading, and keep the rocks and tray clean.
A simple after-use routine
Keeping the grill performing takes only a few minutes per session: let it cool, brush the grate to remove food residue, wipe the surrounding area to prevent grease buildup, and empty and clean the drip tray so grease does not pool. Periodically run the burner hot with the grate removed to burn grease off the rocks, and flip the rocks so the greasy side faces down and burns clean. If the grill is slow to light or burns unevenly, the burner or igniter ports may be fouled — clear them as you would any burner, following our clicking igniter guide.
