Besides a jar of water, what did the angel provide for Elijah under the tree?

Answer: Bread baked on coals

An angel touched Elijah, and by his head was a cake of bread baked over hot coals and a jar of water.

“And he looked around, and there by his head was a cake of bread baked over hot coals, and a jar of water. So he ate and drank and lay down again.”— 1 Kings 19:6 (BSB)