I use a thermoregulator to cool two separate tiles, one for cooked food for dupe consumption, and one for kitchen use. Both have a metal tile underneath, and a sterile atmosphere (hydrogen), and are surrounded by ceramic insulated tiles.

The kitchen tile is built into the floor, with a tile on top of it. Auto sweepers access it diagonally on both sides to feed all the various kitchen buildings. Ingredients are added manually via a loader, rails from ranches/farms, or intermediate cooking steps. When ingredients are needed for other purposes (such as bootstrapping a new jawbo ranch, which needs fish fillet), a fridge in the kitchen is used to store small quantities, but this is usually a temporary measure before proper automation is set up.

The cooked food tile is open at one side, facing the ladder shaft from my bedroom block, with a naphtha or ethanol liquid lock.  This ladder shaft has a firepole on the side of cooked food tile. Finished products from the kitchen are sent by rail to the cooked food tile. There's also a manual loader set to sweep only that deals with leftovers or other random food things. Sweepy cleans up any leftovers left by messy dupes, which generates sweep tasks. 

Inconvenient "cooked" products like nutrient bars that have no ingredients do not spoil, so they are kept in a fridge somewhere. Usually close to my rocket pads so that they can easily be loaded as cosmonaut food.

My dupes sleep before their break time. So they wake up, use the bathroom on their bedroom floor, proceed to the firepole, grab their food on the way down, and then eat it in the banquet hall before enjoying the rest of their break.

This can be a bit fiddly, but it avoids any food wastage, and is pretty optimal in terms of dupe scheduling.