Tandoori Spinach Prawns

Ingredients     8-10 medium-size prawns     1 kg spinach     Salt, to taste     2 tbsp mustard oil     1/2 tsp crushed black pepper     1/2 cup curry leaves     1 green chilli     1/2 cup chopped coriander     Chaat masala, to sprinkle     Juice of 1 lemon, plus for drizzling Preparation     Wash and devein prawns and marinate in salt and lemon juice for 2 hours.     Wash, boil and grind spinach to a fine paste along with curry leaves,green chilli and coriander, using very little water.Mix in crushed black pepper and mustard oil.     Marinate prawns in this mixture for another hour.Skewer prawns and grill for 7-8 minutes or till done, basting occasionally.     Sprinkle chaat masala and lemon juice over and serve immediately.