Heat the oil, and sauté the crushed garlic. Coat the chicken with the flour and seasoning, and fry until browed on all sides. If preferred, the chicken may be cut into neat cubes before cooking.
Lower the heat, add pineapple pieces, grapes and ginger. Continue cooking over low heat for 15-20 minutes, or until tender.
For the sauce, blend all ingredients together, put into a pan, and boil for 2-3 minutes, stirring constantly. Garnish the chicken with pineapple and ginger and serve with the sauce (or you can pour the sauce over the chicken so that it absorbs all that goodness!)