If you don't know what a pastel is, then you're a very unlucky person, but you can check it out here: [1] (the part where it says that sugarcane juice is a common beverage to drink with a pastel is actually bullshit, I never drank that in my life and there's no "common beverage" to drink with it, also: Pastel > Kebab).
To craft (or cook) a pastel, you need to combine a wheat and an egg (for the dough) and a piece of any meat (for the filling) in a crafting table. As a result you'll get a 'Raw Pastel', and it looks like this:
Then you put it in a Hobbit oven or in a furnace to create the 'Pastel' food item.
It restores 10 (), maybe less or maybe more, I'm not good with balancing things.