Abstract: The present invention provides a uniformly-heated heating chamber for a barbecue grill by mounting two U-shaped burners within that heating chamber so the arms thereof extend toward each other to help define a generally rectangular annulus which surrounds the middle of that heating chamber and which is displaced inwardly from the walls of that heating chamber. Gas-emitting ports are provided in the inner and outer faces of the arms and ends of those burners; and hence a central area of burning gas and a generally rectangular surrounding annulus of burning gas are provided by those burners. As a result, burning gas fills substantially all of the length and width of the heating chamber to provide uniform heat across that length and width.