Roast Indian Leg of Lamb

Name: Roast Indian Leg of Lamb
Prep time: 20 min
Cook time: 3 h
Total time: 3 h 20 min
Cuisine: Indian
Ingredients: 2 garlic cloves, chopped; 60ml (4 tbsp) olive oil; 120g (4fl oz) Greek yogurt; 5cm (2in) fresh ginger, peeled and grated; 2 pinches saffron threads; 5ml (1 tsp) ground coriander; 5ml (1 tsp) freshly ground black pepper; 5ml (1 tsp) Madras curry paste; 10ml (2 tsp) dried chilli flakes; 15ml (1 tbsp) tomato ketchup; 10ml (2 tsp) salt; 60ml (4 tbsp) brown sugar; Juice and zest of 1 lemon; 1 leg of lamb, weighing about 2.5kg (5.5lbs)