Onions are a staple in any cook's pantry. Their raw pungency turns sweet when sautéed, and they are an indispensable ingredient in building a flavour base for soups, stews, curries, risottos, and pilafs. Chopped raw onion is an important ingredient in salsas. Yellow onions are a good choice when a recipe specifies simply chopped onion. For the sake of freshness, opt to buy two smaller onions rather than one big one - this way, you'll avoid having half a used onion shriveling in your fridge.