Stir in white sugar, brown sugar and ketchup. Set aside.

Heat 1 teaspoon sesame oil in a small saucepan. Add onion, pepper and ginger. Mix thoroughly and then add wine. Cook for 1 minute or until flavor from ginger becomes aromatic.

Add onion, pepper, ginger, wine and sesame oil. Cook until it boils, reduce heat and stir constantly. Slowly add the cornstarch mixture and cook for about 1 more minute. Add 1 teaspoon sesame oil to finish off.

Serve warm or cold with spring rolls. Can also be used for sweet and sour pork or shrimp dishes.