This Tikka recipe can be made with lamb or chicken, this version is for lamb. Cut lamb into 4cm cubes. Put in a bowl and add cumin, turmeric, salt, yogurt, onion, ginger and garlic. Mix well. Cover and leave in the fridge for 4-6 hours to marinate.
Drain lamb from marinade and thread onto 8 short skewers, pressing cubes together closely.
Heat grill. Cook for 15-20 mins, basting kebabs with any remaining marinade, turning occasionally until well browned and done to taste. Sprinkle with garam masala and serve at once.