Instructions: Arrange 1 oven rack in middle position and another rack in lower third of oven. Reserve 1 cup of the barbecue sauce to serve with ribs.

Rinse ribs and pat dry with paper towels. Score white membrane on underside with knife. Place flat roasting rack in each of 2 large roasting pans. Brush ribs on both sides with vinegar and season generously on both sides with salt, black pepper and cayenne.

Place ribs, meaty side up, on roasting racks in pans. Brush both sides of ribs with barbecue sauce. Roast at 350 degrees until a rich dark brown and tender when pierced with a knife, 1 1/2 to 13/4 hours. Baste top of ribs every 30 minutes with barbecue sauce. After 45 minutes, reverse pans, placing pan on middle rack on lower rack and vice versa. Cover ribs loosely with aluminum foil if they start to brown too quickly.

When done, place ribs on large platter. Heat reserved 1 cup of barbecue sauce and any remaining basting sauce in a medium saucepan over medium heat until bubbling. Pass warmed sauce to drizzle over each serving of ribs.

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