The rules specify using metal or silicone baking trays, so a pizza stone is likely not allowed. If pizza stones are banned, using one inside the oven while baking on a separate tray might also be restricted. Purpose-built pizza ovens, whether gas, electric, or wood-fired, are typically not permitted unless explicitly stated. Commercially pre-cracked eggs are usually considered acceptable, but check the rules to be sure. Mayonnaise and vegan egg substitutes like No Egg powder or liquid forms may be allowed, but confirm with the competition guidelines to ensure compliance.