This was probably a hollow object made of clay. A fire was lit under the oven, and the heat would bake the dough inside of the oven. (See: [[rc://en/ta/man/jit/translate-unknown]])
Translate this phrase to indicate that the oil is to be spread onto the bread. Alternate translation: "with oil on the bread" (See: [[rc://en/ta/man/jit/figs-explicit]])