To a lidded roasting tin or ovenproof pan, add 4 tbsp oil, add 200 g frozen chopped onions or 2 fresh diced white onions, 4 garlic-ginger cubes or 5 cloves minced garlic and 3 inches minced ginger, 8 chicken drumsticks or thighs or 4 diced chicken breasts, 1.5 tsp salt, 2 tsp brown sugar, 1 bay leaf, 1 cinnamon stick, 1 tsp turmeric, 1/4 tsp chili powder, 1 pierced Scotch bonnet or 2 pierced green chilies, 3 heaped tsp garam masala, 2 tsp cumin powder, and 1 tin chopped tomatoes.