Nuts

Nutritionally the richest plant foods after pure fats and oils — averaging ~600 calories per 100g, versus ~350 for dry grains — nuts are defined by their high oil content and the weak cell walls that make them uniquely edible raw or after brief dry heat, without the soaking and long cooking other seeds require. Their characteristic richness, creaminess, and depth come from abundant oil stored in oil bodies, the same phospholipid-stabilized structures found in milk fat globules.