Answer:
This food is usually grilled and put between two buns, with cheese, tomato and pickles.
As soft as silk, as white as milk, as bitter as gall, a thick green wall, and a green coat covers me all.
Five horses follow me to war, all the horses but I didn't.
A toasty and crunchy cereal would be pointless without this spice.
What food has no beginning, end, or middle?
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.