Also called buckwheat lettuce or buckwheat greens.
They are rich in taste and easy to grow.
In Nepal, faparko saag are basically cooked like other greens as being seasonal greens. Fapar [buckwheat] is basically grown for grains but people eat the greens as cooked or raw.
While buckwheat leaves and buckwheat microgreens [sprouts] are indeed edible, these nutrient-dense leaves contain a poisonous substance, fagopyrin, which can make us sick when consumed in large amounts. That is why it is safe to eat while cooked.