Hom Daeng & Hom Hua Yai — Shallot vs Onion in Thai Cooking / หอมแดง หอมใหญ่
Pan-Thai — red shallots are the universal base allium; onion is the Muslim-influenced exception
Thai cooking uses red shallots (hom daeng, Allium cepa var. aggregatum) as the default allium — not white or brown onions. Shallots are smaller, more pungent when raw, sweeter when cooked, and have a more delicate texture that breaks down fully in curry pastes and caramelises beautifully when fried. They appear in curry pastes (pounded raw), as crispy shallots (hom jiaw — fried until golden-brown), in yam salad dressings, and as whole roasted shallots in certain Northern pastes. Yellow or white onions (hom hua yai, 'big onion') are used in massaman curry and dishes with Muslim-Malay influence, and increasingly in stir-fries, but are considered a foreign ingredient in classical Thai cooking.