A pea pod and an apple look nothing alike, yet both develop from the same part of a flower. Which part is it?

Explication

Whatever its final texture, the case that encloses seeds grows from the chamber that held the ovules, which is why a dry pod and a juicy apple are the same thing biologically. Restricting the word fruit to sweet edible ones is a kitchen habit rather than a biological rule, and the ovules inside become the seeds, not the case around them.