1. A construct for heating a food item in a microwave oven, comprising:a bottom panel having a first longitudinal edge, a second longitudinal edge opposite of the first longitudinal edge, an inner surface and an outer surface;
a first side panel extending upwardly from the first longitudinal edge of the bottom panel, the first side panel having an inner surface and an outer surface; and
a second side panel extending upwardly from the second longitudinal edge of the bottom panel, the second side panel having an inner surface and an outer surface;
the bottom panel, the first side panel and the second side panel form a U-shaped tray with at least one open end defining an interior space for receiving the food item;
at least one fold area between the bottom panel and the first side panel or the second side panel;
the inner surface of the bottom panel includes a microwave susceptor comprising:
a biodegradable substrate comprised of a biodegradable thin film; and
a susceptor layer on the biodegradable substrate, the susceptor layer comprising a pattern of metallized material corresponding to a selected pattern of heat to be applied to the food item within the construct, wherein the pattern of metallized material includes at least one demetallized area corresponding to the at least one fold area.