Memphis-Style Ribs

INGREDIENTS

• 1 tablespoon salt
• 4 1/2 teaspoons freshly ground black pepper
• 1 1/2 teaspoons dry mustard
• 1 1/2 teaspoons cayenne pepper
• 1 1/2 teaspoons ground cumin
• 1/2 cup yellow (ballpark) mustard
• 2 cups cider vinegar
• 1 1/2 teaspoons garlic powder
• 4 1/2 teaspoons dark brown sugar
• 3 racks baby back pork ribs (about 7 pounds), or 2 racks pork spareribs (6 to 8 pounds total)
• 2 teaspoons salt
• 1/4 cup sweet paprika
• 1 1/2 teaspoons celery salt