My homemade Tikka paste is as follows. You don't need to measure this out, near enough measurements are good.
1 med onion chopped
1-2 cloves garlic chopped
2 thirds of a large pot natural yoghurt
1 tsp Ground cumin
1 tsp Ground coriander
1 tsp Turmeric powder
1 tsp Fenugreek powder
1 good squirt tomato puree
2 Tbsp Lemon Juice
Put the above in a blender and blitz to a smooth paste. You can add a bit of chilli if you want a kick.
Take chicken, if chicken joints, make 3 slits to the bone. If using whole or chopped breast there is no need to slit.
Rub a little salt and lemon juice over the meat. Put in a dish and coat with mix from blender. Marinate for a minimum of 20 mins.
The longer it marinates the better. You can do this the day before and leave it in the fridge covered with foil.
Line a grill tray with foil. Lightly rub a little veg oil over the foil with kitchen towel, to prevent sticking.
Grill under a medium grill until cooked, turning occasionally. Then if needed. turn up the grill to add slight charring to the edges.
Serve on a bed of salad leaves with raw onion rings (Red onion is good), tomato and wedges of lemon.
This really is quite quick to make.