Heat the oil in a fryng pan, over a moderate heat add the onion, garlic, chillies and tomatoes. Cook for 4-5 minutes. Sieve the cooked tomatoes into a bowl, add the tabasco and seasonong to taste. Put to one side whilst cooking the prawns. Place the egg whites, coconut and cornflour in a bowl and mix together. Heat the oil in a heavy based pan to 170 C, 370 F, using a cooking thermometer or alternatively if avaialble, use a thermostatically controlled deep fat fryer. Dip each prawn into the tempura batter and fry the prawns, 4-5 at a time, for 3 minutes until golden brown. Notes Serve the prawns with the chilli tomato sauce as a starter or with drinks. NOTES : Oriental style dish of deep fried prawns.