Thermoelectric food preparation zone control

A method comprising:

• activating one or more first thermoelectric modules in or on a first platform of a serving tray, one or more supply sides of the one or more first thermoelectric modules facing a first serving surface of the first platform;
• activating one or more second thermoelectric modules in or on a second platform of the serving tray, one or more supply sides of the one or more second thermoelectric modules facing a second serving surface of the second platform, a stem extending from the first serving surface of the first platform to a bottom surface of the second platform;
• and
• circulating a fluid through a fluid transfer path, wherein the fluid transfer path comprises:
• a first flow path inside the first platform;
• a second flow path inside the second platform;
• a third flow path inside the stem and extending between an outlet of the first flow path and an inlet of the second flow path;
• and
• a fourth flow path inside the stem extending between an outlet of the second flow path and an inlet of the first flow path.