Heat oven to 400 degrees F. Place spareribs on shallow baking pans; cover with foil and bake for 1 1/2 hours.
Meanwhile combine water, butter, lemon juice, dry mustard, chili powder, sugar, paprika, salt, onion powder, garlic powder and cayenne in medium saucepan. Bring to a boil, stirring. Reduce heat and simmer for 30 minutes, stirring occasionally. Set aside.
After 1 1/2 hours, remove foil and brush with sauce, then roast for additional 20 minutes. Serve ribs with additional sauce.
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