Tadka (also called chaunk or tempering) is the technique that gives Indian food its distinctive aroma and flavor layers: **The science** - blooming spices in hot oil or ghee releases fat-soluble flavor compounds that water-based cooking cannot access. **Temperature is critical** - oil should be shimmering but not smoking. Too cold and spices will not bloom; too hot and they will burn instantly. **Order matters** - add spices in sequence based on how long they need. Mustard seeds first (they will pop), then cumin, then curry leaves, then chiles. **Two approaches** - tadka can start a dish (cooking base) or finish it (poured over dal or yogurt dishes for a flavor punch). **Essential tadka combinations**: - South Indian: mustard seeds, curry leaves, dried red chiles, urad dal - North Indian: cumin seeds, asafoetida, garlic - Bengali: panch phoron (five-spice blend), bay leaf