Sweet and Sour Broiled Spareribs

Sweet and Sour Broiled Spareribs
4 lbs. lean spareribs
2 onions, chopped
1/3 cup brown sugar
1/2 cup vinegar
1 tbsp. soy sauce
1/2 cup pineapple juice
1/3 cup water
1/2 tsp. salt
1/4 tsp. fresh ground pepper
1 tbsp. cornstarch

Place ribs on broiler pan. Sprinkle with salt and pepper. Broil until deep brown on both sides.
Saute onions in deep pot until softened. Add all other ingredients, except cornstarch. Add ribs. Cover pot and simmer for 2 hours. Remove ribs. Make paste with cornstarch and spoonful of water. Thicken sauce with cornstarch paste. Return ribs to sauce. Transfer to serving dish.