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Preheat oven to 300°F (150°C).
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Cut each full rack of ribs in half, so that you have 4 half racks. Sprinkle salt and pepper (more pepper than salt), and 1 tablespoon chili pepper over meat. Wrap each half rack in aluminum foil. Bake for 2 1/2 hours.
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Meanwhile, heat oil in a medium saucepan over medium heat.
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Cook and stir the onions in oil for 5 minutes. Stir in water, tomato paste, vinegar, brown sugar, honey, and Worcestershire sauce. Season with 2 teaspoons salt, 1/4 teaspoon black pepper, liquid smoke, whiskey, garlic powder, paprika, onion powder, dark molasses, and 1/2 tablespoon ground chili pepper.
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Bring mixture to a boil, then reduce heat. Simmer for 1 1/4 hours, uncovered, or until sauce thickens.
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Remove from heat, and set sauce aside.
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Preheat an outdoor grill for high heat.
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Remove the ribs from the oven, and let stand 10 minutes.
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Remove the racks from the foil, and place on the grill. Grill the ribs for 3 to 4 minutes on each side.
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Brush sauce on the ribs while they're grilling, just before you serve them (adding it too early will burn it).