Cut the broccoli into 1 1/2 inch lengths. Heat the oil in a saucepan, add the broccoli and fry for 2-3 minutes. Add the sugar, salt ginger and garlic, cover the pan and cook slowly for 4-5 minutes. Mix the soy sauce sherry, and corn flour (cornstarch) with 3 tablespoons (1/4 cup) water. Stir this in to the saucepan, cover again and cook for a further 3-4 minutes. Add the pork and reheat.