Ingredients

6 tablespoons mustard (yellow)

2 tablespoons ketchup

3 medium cloves garlic , minced or pressed through garlic press (about 1 tablespoon)

2 teaspoons ground black pepper

1 tablespoon sweet paprika

1 tablespoon chili powder

1/2 teaspoon cayenne pepper

1 1/2 tablespoons kosher salt

3 tablespoons brown sugar

2 racks St. Louis-style spareribs , 2 1/2 to 3 pounds each, trimmed of surface fat, membrane removed, each rack cut in half

1/4 cup Lapsang Souchong tea leaves (finely ground)-from about 10 tea bags, or 1/2 cup loose tea leaves ground to a powder in a spice grinder)

1/2 cup apple juice

Preparation

  1. For the Rub: Combine mustard, ketchup, and garlic in small bowl; combine pepper, paprika, chili powder, cayenne, salt, and sugar in separate small bowl. Spread mustard mixture in thin, even layer over both sides of ribs; coat both sides with spice mixture, then wrap ribs in plastic and refrigerate for at least 8 hours and up to 24 hours.

  2. Transfer ribs from refrigerator to freezer for 45 minutes. Adjust one oven rack to lowest position and second rack to upper-middle position (at least 5 inches below broiler). Place baking stone on lower rack; heat oven to 500 degrees. Sprinkle ground tea evenly over bottom of rimmed baking sheet; set wire rack on sheet. Place ribs meat side up on rack and cover with heavy-duty foil, crimping edges tightly to seal. Roast ribs directly on stone for 30 minutes, then reduce oven temperature to 250 degrees, leaving oven door open for 1 minute to cool. While oven is open, carefully open one corner of foil and pour apple juice into bottom of baking sheet; reseal foil. Continue to roast until meat is very tender and begins to pull away from bones, about 1 1/2 hours. (Begin to check ribs after 1 hour; leave loosely covered with foil for remaining cooking time.)

  3. Remove foil and carefully flip racks bone side up; place baking sheet on upper-middle oven rack. Turn on broiler; cook ribs until well browned and crispy in spots, 5 to 10 minutes. Flip ribs meat side up and cook until well browned and crispy, 5 to 7 minutes more. Cool for at least 10 minutes before cutting into individual ribs. Serve with barbecue sauce, if desired.