Bowl

"Bowls were added to Minecraft in January 2010. Originally they could only be used to craft mushroom stew, but in version 1.0.0 it also became possible to use them to milk mooshrooms for additional mushroom stew, and then subsequently to craft rabbit stew and beetroot soup. If you really hate bowls, then you can also burn them in a furnace as fuel."

- Duncan Geere

Bowls are containers that can hold certain foods.

Fishing
Bowls can be obtained as a "junk" item while fishing.

Eating
A bowl containing food becomes an empty bowl when the food is eaten.

Turtles
When a turtle is killed by a lightning bolt, it drops 0-1 bowls.

Mooshrooms
a bowl on a mooshroom turns the bowl into mushroom stew. The stew can then be consumed immediately and the process repeated, making this an excellent way to quickly restore depleted hunger and saturation with almost no cost or effort. Inventory space is saved because there is no need to store red and brown mushrooms, and the mooshroom isn't turned into a cow as it would be if it were sheared for its mushrooms.

Fuel
Bowls can be used as a fuel in furnaces, smelting 0.5 items per bowl in Java Edition, and 1 item per bowl in Bedrock Edition.