Peel the melon and remove the pips. Slice into 8 slices. Cube the ham and feta cheese, and quarter the litchis. Combine the sour cream, natural yoghurt and mayonnaise. Season with dill and lemon pepper. Place a slice of melon on a side plate. Pour a little sauce over the centre of the melon and on the plate. Arrange the ham and cheese squares as well as the litchi quarters on the sauce.