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Onions are a staple in every kitchen—whether they’re caramelized and used to top a burger or cooked underneath your Sunday roast—onions are a flavor powerhouse. They are sweet, savory, and pungent all at once, adding extra depth to any dish. Selecting the right kind of onion for cooking with will give your dish the tastiest results. Here’s a helpful guide to each type of onion and ways to use them.