Rogan Josh

Ingredients

600g Lamb (or Beef)
3 cloves garlic
1 tablespoon ginger
1 teaspoon turmeric
3 teaspoons garam masala
2 teaspoons ground coriander
2 teaspoons ground cumin
2 teaspoons red chilli powder (or tube)
2 desert spoons plain yoghurt
2 medium onions
1 tin tomatoes