Preheat oven to 350°F. For sauce, whisk first 7 ingredients in heavy small saucepan to blend. Place spareribs, bottom side up, on large baking sheet. Sprinkle with salt and pepper; spread with 1/3 cup sauce. Turn ribs over. Sprinkle with salt and pepper; spread with 1/3 cup sauce. Bake ribs 45 minutes.
Bring remaining sauce in pan to boil. Brush 2 tablespoons sauce over ribs. Bake ribs until sauce forms sticky glaze, about 8 minutes. Cut rack into individual ribs; serve with sauce.
