1 Tbsp crushed coriander seed
1 Tbsp crushed cumin seed
1 Tbsp Crushed black pepper
1 tsp cinnamon
1 tsp tumeric
1tsp - 1 Tbsp Crushed salt. (depending on taste)
Mix with 2 Tbsp olive oil, (and 4 Tbsp Yoghurt if available)
Rub over the lamb and leave for at least 1 hr.
Then
slowly roast in the camp oven.
Or alternatively
Stab the leg of lamb with a knife and insert sliced garlic & rosemary into the holes,
Rub a little oil over the leg, light sprinkle of salt, and /or cover with mustard.
Slow roast again.
Dammit, now I'm hungry.
EDIT- Double dammit, you beat me to it Mrs Ho Har!