Clean the ribs, and trim away any excess fat. In a medium bowl, stir together the sugar, 1/4 cup salt, ground black pepper, paprika, 1 teaspoon cayenne pepper, and garlic powder. Coat ribs liberally with spice mix. Wrap ribs in tin foil and place in refrigerator 8 hours (overnight preferably).
Preheat oven to 275 degrees F (135 degrees C). Bake uncovered for 3 to 4 hours, or until the ribs are tender and nearly fall apart.
Preheat grill for medium-low heat.
When ready to grill, add soaked wood chips to the coals or to the smoker box of a gas grill. Lightly oil grill grate. Place ribs on the grill two racks at a time so they are not crowded. Cook for 20 minutes, turning occasionally. Baste ribs with sauce during the last 10 minutes of grilling, so the sauce does not burn.
Remove 5 tablespoons of drippings from the bottom of the roasting pans, and place in a skillet over medium heat. Cook onion in pan drippings until lightly browned and tender. Stir in ketchup, and heat for 3 to 4 more minutes, stirring constantly. Next, mix in water and brown sugar, and season to taste with cayenne pepper, salt, and pepper. Reduce heat to low, cover, and simmer for 1 hour, adding water as necessary to achieve desired thickness.
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