Lamb Curry in a Hurry

200g (7oz) lean Scotch Lamb i.e. neck fillet or leg steaks, cut into thin slices

2 tbsp olive oil

1 red onion, halved and sliced

2 tsp ready prepared ginger from a jar

1 tsp ready prepared chillies from a jar

1 tsp ready prepared garlic from a jar

1-2 tsp Garam Masala or mild curry powder

3 ripe tomatoes, chopped or 200g can chopped tomatoes

3 tbsp natural yoghurt

Fresh herbs or shredded cucumber, to garnish