Microwave heatable tray for frozen food, package of frozen food, package of frozen sushi, and method of thawing frozen sushi

a b ab The present invention provides a tray for frozen food enabling frozen food such as frozen sushi on the tray to be suitably thawed and to provide a frozen food package or a frozen sushi package using this tray, and a method of thawing frozen sushi in this package. The tray for frozen food comprises a base , concavities caved in the base , a surrounding wall standing from the periphery of the base , a flange composing the top end of the surrounding wall , a downward flap extending downwardly from the outer peripheral edge of the flange , an overhanging portion overhanging outward from the lower edge of the downward flap , ribs formed at corners between the base and the surrounding wall , and bulges standing from the base . The tray is composed of a body made of a synthetic resin and a dielectric material layer formed on the outer surface of the body . Frozen sushi is disposed such that the shari ball is entirely or mostly positioned within the concavity and the neta is entirely positioned above the level of the base . The frozen sushi is thawed in such a manner that the shari ball is thawed with heat transmitted from the dielectric material layer by heating the frozen food package by a microwave oven and the neta is thawed with heat transmitted from the shari ball after stopping heating the package in the microwave oven.