To make the Sweet and Sour Sauce, blend the sugar, salt, tomato ketchup and vinegar in a saucepan. Simmer over low heat. Stir in the cornstarch mixture. Continue simmering, stirring occasionally, until the sauce thickens. Turn off heat and set aside.
Heat the oil in a frying pan and sauté the garlic and onions. Add pork and and sauté until lightly browned. Add