Answer:
A fruit on a tree. A tree on a fruit.
I'm a food made of flour, water, and yeast or another leavening agent, mixed together and baked. You need me to make a sandwich.
Sauerkraut owes its existence to this head
Green on the outside but red and black inside. I am food but mostly liquid. What am I?
What fruit is of great use in history?
What goes around and around the wood, but never goes into the wood?