The tandoori marinade system is a two-stage process that's almost always simplified to a single step in Western recipes — and that simplification is why home tandoori never tastes like restaurant tandoori. The first marinade is a brief rub of salt, turmeric, chilli powder, lemon juice, and sometimes raw papaya paste (as a tenderiser). This sits for 30-60 minutes and begins to break down the protein surface. The SECOND marinade is the yogurt-based coating: thick yogurt, ginger-garlic paste, garam masala, Kashmiri chilli (for colour), and cream or mustard oil. This sits for 4-24 hours. The two stages create different effects that a single combined marinade cannot replicate.
First marinade (the rub): lemon juice acid begins surface protein denaturation, salt draws out moisture, turmeric provides colour and its own antimicrobial properties. Scoring the meat (deep cuts to the bone for chicken legs, crosshatch for chicken breast) is essential — the marinades must penetrate deep. Second marinade (the coat): yogurt's lactic acid continues tenderising, the thick coating insulates the meat during high-heat cooking, and the sugars and proteins in the yogurt promote Maillard browning in the tandoor's extreme heat. For tikka: boneless pieces marinated identically but cut smaller (3-4cm cubes) for skewer cooking. The high fat content of the second marinade (from cream or oil) prevents the small pieces from drying out.
For the brightest colour without artificial colouring: Kashmiri chilli powder (mild, vivid red) plus a pinch of turmeric. For home tandoori without a tandoor: maximum oven heat (260°C+) with the broiler on, meat on a wire rack over a tray, as close to the top element as possible. Or use a very hot charcoal grill. The key insight for home cooks: bring the marinated meat to room temperature for 30 minutes before cooking — cold meat entering extreme heat seizes on the outside before the interior warms. Butter chicken (murgh makhani) was invented to use leftover tandoori chicken — the tomato-cream-butter sauce was designed to rehydrate and enrich already-cooked tandoori meat.
Single-stage marinating — the two stages serve different chemical purposes. Using Greek yogurt that's too thick — it doesn't spread into the scoring cuts. Using too much lemon juice — more than a tablespoon per kg of meat makes it mushy. Not scoring the meat deeply enough. Marinating more than 24 hours in yogurt — the surface becomes chalky. Using food colouring for the red colour — Kashmiri chilli provides colour naturally, or use a mix of paprika and cayenne.