INGREDIENT KNOWLEDGE
Onion
Onions are foundational alliums that can taste sharp and sulphurous when raw, sweet and mellow when cooked, and deeply savoury when slowly browned.
What Is an Onion?
Common bulb onions belong mainly to Allium cepa. Yellow, white, red, sweet, and small pearl onions differ in pungency, sugar level, texture, and best use. Their layered bulbs store energy for the plant and contain sulphur compounds that create their characteristic aroma.
Flavor and Cooking Behaviour
Cutting breaks onion cells and releases pungent compounds. Heat softens them and converts harshness into sweetness. Sweating produces a soft, translucent aromatic base; sautéing develops more browning; long, slow cooking concentrates sweetness and creates caramelized flavours.
How to Choose and Store
Choose firm, heavy bulbs with dry skins and no soft spots, mould, or wet necks. Store whole dry onions in a cool, dark, ventilated place. Refrigerate cut onions in a covered container and use promptly. Sweet onions generally contain more moisture and may keep less well than storage onions.
Preparation
Slice with the grain for pieces that hold their shape better, or across the grain for quicker softening. Dice for sauces and aromatic bases, cut into wedges for roasting, shave thinly for salads and pickles, or purée for marinades and curry bases.
Culinary Uses
Onion is central to Filipino ginisa, French mirepoix, Italian soffritto, Indian masalas, Middle Eastern stews, Mexican salsas, Chinese stir-fries, and countless soups, stocks, sauces, curries, braises, salads, pickles, and grilled dishes.
Pairings and Substitutions
Onion pairs with garlic, ginger, tomato, herbs, chilli, butter, oil, vinegar, meat, legumes, eggs, and nearly every savoury spice. Shallot offers a finer, sweeter profile; leek is gentler; scallion is fresher and greener.
Common Mistakes
- Crowding the pan when browning onions.
- Using high heat for caramelization and burning the sugars.
- Ignoring differences between sweet, red, white, and storage onions.
- Storing cut onion uncovered.
Chef’s Notes
Onion is not just bulk for a sauce. Control its cut, heat, and cooking time according to the role you want: crisp freshness, aromatic sweetness, or browned savoury depth.
Related Ingredients
Garlic, shallot, leek, scallion, chives, and ginger are useful ingredients to explore alongside onion.
Recipes Using Onion
- Burundian Ndagala — Lake Tanganyika-Style Small Fish in Tomato Sauce
- Burundian Lenga-Lenga — Braised Amaranth Greens with Tomato
- Burundian Isombe — Slow-Cooked Cassava Leaves with Groundnuts
- Burkinabè Poulet Bicyclette-Style — Charcoal-Grilled Spiced Chicken
- Burkinabè Sauce Gombo au Soumbala — Okra and Fermented Locust Bean Sauce
- Burkinabè Babenda — Greens, Cracked Rice and Groundnut Stew
- Bulgarian Bob Chorba — White Bean Soup with Savory and Mint
- Bulgarian Kavarma — Pork, Peppers and Mushrooms in a Clay-Pot Stew
- Bruneian Soto Daging — Fragrant Beef Broth with Noodles
- Botswana Dikgobe — Slow-Cooked Samp and Cowpeas
- Botswana Morogo wa Dinawa — Simmered Cowpea Leaves
- Bosnian Begova Čorba — Chicken and Okra Soup
Recipes connected to this guide
- Afghan Mantu — Steamed Beef Dumplings with Yogurt Sauce
- Afghan Qabili Palaw — Lamb, Carrot and Raisin Rice
- Albanian Fërgesë e Tiranës — Peppers, Tomato and Cheese
- Albanian Tavë Kosi — Baked Lamb and Yogurt
- Algerian Chakhchoukha Biskria — Lamb and Rougag
- Algerian Couscous with Lamb and Vegetables
- Andorran Escudella — Meat and Vegetable Stew
- Angolan Calulu de Peixe — Fish, Greens and Okra Stew
- Angolan Feijão com Óleo de Palma — Beans in Red Palm Oil
- Angolan Muamba de Galinha — Chicken and Palm Sauce Stew
- Angolan Mufete de Peixe — Grilled Fish with Beans and Cassava
- Antiguan Ducana with Saltfish