1. Mix garlic, ginger and 1 1/2 teaspoons Rogan Josh Mix in a large bowl, then stir through lamb ensuring the meat is well coated. Cover and marinate for 2 hours if time allows.
2. Heat oil in a pan on a low heat add onion & cook for around 10 minutes or until lightly browned
3. Add remaining Rogan Josh Mix and stir for 2 minutes
4. Add lamb to casserole dish increase heat to medium, stir through for 5 minutes
5. Reduce to a low heat cover & cook for 15 minutes
6.Uncover & fry for another 3 minutes, or until the meat is quite dry
7. Add 1/2 cup water, cover then cook for 5-7 minutes. Uncover fry for another 2 minutes then add a cup of water, cover & cook for 40-50 minutes gently simmering until meat is tender.
8. Soak saffron in tablespoon of milk
9. Stir through yoghurt when meat only has 5 minutes to go, then add milk & saffron, stir