Earth oven is added over everything. The food in the pit can take up to several hours to a full day to cook, regardless of the dry or wet method used. Today, many communities still use cooking pits for ceremonial or celebratory occasions, including the indigenous Fijian lovo, the Hawaiian imu, the Māori hāngi, the Mexican barbacoa, and the New England clam bake. The central Asian tandoor use the method primarily for uncovered, live-fire baking, which is a transitional design between the earth oven and the horizontal-plan masonry oven. This method is essentially a permanent earth oven made out of clay or
Convection oven heating element which increases the oven's ability to cook foods evenly. Another form of a convection oven is called an "impingement oven". This type of oven is often used to cook pizzas in restaurants. Impingement ovens have a high flow rate of hot air from both above and below the food. The air flow is directed onto food that usually passes through the oven on a conveyor belt. Impingement ovens can achieve a much higher heat transfer than a conventional oven. There are also convection microwave ovens which combine a convection oven with a microwave oven to cook food with