Seed Oils and Oil-Rich Seeds

Seed oils extend the culinary reach of nuts and legumes into cooking fats and flavor carriers. The method of extraction — mechanical pressing or solvent dissolution — determines the oil’s flavor, allergenic potential, and suitable uses. Rancidity is the universal risk: all seed oils contain unsaturated fatty acids that oxidize into cardboard-and-paint-smelling fragments when exposed to light, heat, oxygen, or time.

Extraction methods

Cold-pressed (expeller-pressed): Cells are crushed and oil forced out by mechanical pressure. Heat from friction rarely exceeds boiling point. Trace compounds — including flavor molecules and potential allergens — remain. Used primarily as flavoring oils (stronger, distinct character). Flavor intensifies further if seeds are roasted before pressing.