Barbecued Pork Ribs

Name: Barbecued Pork Ribs
Ingredients: 2 racks (2 to 2 1/2 pounds each) Saint Louis-style pork ribs; Vegetable oil, for grill rack; 2 tablespoons packed light-brown sugar; 2 tablespoons coarse salt; 2 teaspoons freshly ground pepper; 2 teaspoons hot paprika; 2 teaspoons mustard powder; 1 teaspoon celery seed; 2 tablespoons vegetable oil; 1 small yellow onion, finely chopped (1 cup); 3 garlic cloves, minced; 1/4 teaspoon red-pepper flakes; 1/4 cup tomato paste; 1/4 cup bourbon; 1 cup strained tomatoes; 1/2 cup cider vinegar; 1/4 cup Worcestershire sauce; 1 cup water; 1/4 cup plus 2 tablespoons light-brown sugar; Coarse salt and freshly ground pepper; 2 tablespoons packed light brown sugar