What is leave film on tray do not vent?

Leaving film on a tray and not venting refers to a cooking method where food is enclosed in a covered tray with plastic wrap or aluminum foil and then baked or steamed without creating any holes or openings for steam to escape. This method is used to trap steam and moisture inside the tray so that the food retains its natural flavor, texture and nutrients.

It is important to use a tray with a tight-fitting lid or cover to prevent any moisture from escaping during the cooking process. This method is commonly used to cook vegetables, poultry, fish, and some kinds of meat.

Leaving the film on the tray and not venting it may result in the build-up of pressure and steam which could cause the wrap or cover to burst, releasing the steam and moisture and potentially burning the hands and face of the person opening the tray. Hence, it is important to carefully remove the cover or wrap, in a safe and controlled manner, once the cooking process is complete.

Overall, leaving film on a tray and not venting it is a useful cooking technique for preserving the taste and texture of food, but it should be done with caution and care to avoid any potential safety hazards.