Lightly beat the eggs with the sugar and 3 tablespoons water in a bowl

Melt 2 tablespoons of the butter in a skillet over low heat, pour in the egg mixture and tilt the skillet to cover the base evenly

Cook until the omelet is set underneath but still soft on top, then fold the left side over to the middle and the right side over on top of it

Slide the omelet onto a warm serving dish and "glaze" by gently spreading the remaining butter over the surface

Alternatively, sprinkle with sugar and flash under the broiler