Ingredient

Bean sprout

Germinated mung beans, grown for crunch rather than flavour. They collapse within a minute of heat, so they go in at the very end of a stir-fry or raw into a bowl of pho where the broth barely wilts them.

Sourcing
Asian groceries and supermarket chillers. They are among the most perishable things sold and are best bought the day they are used.
Varieties
Mung, Soybean, Alfalfa
Quality cues
White, plump and crisp with pale yellow tips. Browning heads and a sour smell mean they have turned, which happens fast.
Substitutions
Shredded cabbage, for crunch, Soybean sprouts, sturdier, Julienned water chestnut
Storage
Refrigerate submerged in cold water, changed daily, or use immediately.
Shelf life
2-3 days refrigerated