Buckwheat was an important food ingredient in northern Eurasia: the Russians used it to make "kasha", while in Brittany it is the "black wheat" used in savory crepes called "galettes". In today's food industry, buckwheat is being "relaunched" as a substitute for cereals, as it is gluten-free.
Buckwheat wax is rich in phytosterols and used for its anti-puffiness properties.