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.
BBQ Sauce
5 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.