If your on an adventure and need food you could kill a cow, chicken, pig..... Stuff like that but they give you raw food, which does not last long for hunger. You could cook the food with a furnace but that requires a good amount of effort. Here's how to get cooked food on the go:
1. Light animal on fire
2. Extinguish fire
3. KILL IT!!!!

Now you know how to get cooked food on the go.