Answer:
What is the only chain we can eat?
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.
I'm a flat circular spongy roll made from yeast dough and eaten toasted and buttered
What is round, has a twin, and sees more than most?
The leaves are on the fruit, the fruit on the leaves. What is it?
Not born, but from a Mother's body drawn. I hang until half of me is gone. I sleep in a cave until I grow old. Then valued for my hardened gold.