Tamarind Prawns

If using prawns with heads on, trim off eye portions and legs of prawns, but leave unpeeled. In a mixing bowl, combine thick tamarind concentrate, salt, pepper, sugar and fish sauce. Mix in prawns and leave for 15 minutes. Heat enough oil to coat the bottom of nonstick skillet/frying pan until hot. Fry prawns in batches to prevent overcrowding, over moderate heat for 3-5 minutes or until prawns are cooked.