heat oil in a deep frier or a pot of oil for deep frying . when the oil is hot gently add the puff pastry triangle , one at a time , and only a few at a time to ensure they don't stick together and cook evenly . let cook for a couple of minutes and turn and cook for a few minutes more until they are lightly golden brown . repeat the process with the rest , if they start to brown too quickly it means your oil is too hot so turn it down a bit a try again . They should be light , crisp , puffy and golden brown . once cooked remove from the oil and drain on kitchen paper , dust with fine grain sugar .