Whisk eggs, cream and soy sauce, season with 2 tsp curry, 1 tsp salt and pepper. Wash the coriander, shake dry and pluck off the leaves.
Heat oil and butter bit by bit in a large pan. Add the egg mixture in portions at low to medium heat, stirring occasionally to form creamy scrambled eggs. Add the prawns and coriander to the scrambled eggs, possibly sprinkle with a little curry.
Arrange on the slices of bread. Serve with sweet and hot chilli sauce.