Fast, Slow cooked Leg of lamb with sweet potato

This is my version of fast slow cooked lamb. It might take ages to cook, but your input is minimal.
The lamb was cheap frozen supermarket brand, it hadn't properly thawed and i didnt have time for onions. However, it made no difference to the final taste whereas in previous recipes i browned all ingredients in a particular order. Due to the long cooking, the sweet potato's had almost become mash which made the sauce quite thick, so need for the use of onions or a thickening agent.

half leg of lamb
2 tbsp baharat
2 tbsp garlic puree
1.5 tsp salt
1 tsp lamb seasoning
1 tsp paprika
1 tbsp oil
4 sweet potatos
half pint stock
3 salad tomato's or 4 ice cubes of passata

wash and dry lamb, make incisions, mix all the spices with the oil and rub into lamb inserting into slits. slice potato's and put in the bottom of sc pot, put the leg on top, pour stock over and then add tomatoes.

Slow cook for 8-10hrs. Enjoy with rice