Exotic Grilled Prawns

tiger prawns	500g, peeled
onion	1/2, chopped
red chilli powder	2tsp
turmeric powder	1/4tsp
cumin powder	1tsp
garam masala	1/2tsp
sugar	1/2tsp
garlic	2cloves, chopped
ginger	1inch piece, chopped
salt	to taste
yogurt	300ml
fresh coriander	1tbsp, chopped
lemon	sliced
olive oil	1tbsp
Method:
In a food processor, combine onion, garlic, ginger, red chilli powder, turmeric powder,
cumin powder, garam masala powder, salt, sugar, yogurt and oil.
Process until smooth, then transfer it to a large bowl.
Stir in the fresh coriander and coat prawns with this mixture thoroughly.
Thread the prawns onto skewers.
Cover it with clingfilm and keep it in the fridge for 3 hours.
Preheat the grill on medium.
Arrange skewers on the grill rack.
Cook it, turning and brushing with mixture for 4 minutes until cooked through.
Serve sizzling hot with lemon slices.