Marinate Chicken
Combine chicken with yogurt, turmeric, salt, and ginger-garlic paste. Let sit for 30 minutes (or overnight).
Make Achari Masala
Dry roast fennel, mustard, nigella, fenugreek, and cumin seeds in a pan for 1–2 minutes. Cool and grind coarsely.
Cook
Heat mustard oil until it smokes slightly, then cool slightly and reheat. Sauté onions until golden. Add green chilies, ground achari masala, red chili powder, coriander powder, and fry for a minute.
Stir in tomato and cook until the oil separates.
[Optional] stir in Indian pickle
Add marinated chicken and cook until it browns and cooks through (15–20 min), stirring occasionally. Add a splash of water if needed.
Stir in vinegar/lemon juice and garam masala. Simmer briefly. Garnish with cilantro.
