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.

 

Remove ribs from oven, uncover and brush liberally with sauce. Grill ribs directly over fire, brushing with sauce to glaze well, for about 20 minutes total. Serve ribs with additional sauce.