Endosperm

The endosperm is a tissue produced inside the seeds of most flowering plants following double fertilization. It is triploid in most species, which may be auxin-driven. It surrounds the embryo and provides nutrition in the form of starch, though it can also contain oils and protein.

This can make endosperm a source of nutrition in animal diet.
For example, wheat endosperm is ground into flour for bread, while barley endosperm is the main source of sugars for beer production.
Other examples of endosperm that forms the bulk of the edible portion are coconut "meat" and coconut "water", and corn.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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