Beat the yolks with the sugar, then add the orange flavoring. Beat whites separately until stiff. At medium-high heat, melt butter in a nonstick omelet pan or skillet. Gently fold the whites into the yolk mixture, then pour the mixture into the warm pan or skillet. Do not stir as it cooks. After 1 minute, fold omelet and place on a warmed dinner plate. Arrange garnish, and serve.