Multiple fruits

Multiple fruits come from multiple flowers. (Contrast simple fruits, which come from single ovaries, and aggregate fruits, which come from multiple ovaries in a single flower.)

A pineapple is an example of a multiple fruit. It includes all of the ovaries in multiple flowers PLUS bases of petals, sepals, bracts between flowers, and the flowering stalk (stem) itself. Thus, there is a lot of accessory tissue in a multiple fruit.