Bowl of Soup

Food from a Cooking Pot sits a tier above the fruit and mushrooms you find lying around, and this is one of the first recipes that reaches that tier. The ingredients are ordinary early game pickups, so the sensible habit is to keep a pot in your base and cook a batch before any boss attempt rather than eating whatever was in your pocket. Later foods give the same effect for longer, so once you have those the soup becomes filler, but for the whole first stretch of a world it is the cheapest way to walk into a fight already buffed.