1. Remove ribs from packaging. Place on baking sheet. Trim excess fat and silver skin from back of ribs. Rub salt into both sides of ribs. Refrigerate for at least 3 hours or overnight. 
2. Preheat oven to 300° F. In a small bowl, combine brown sugar, black pepper, onion powder and paprika. Rub mixture into meat on both sides. Loosely wrap ribs in foil. Place on baking sheet. Cook for 3 hours. After 3 hours, open the foil. Spoon some of the juices from ribs over the top. Increase oven temperature to 375° F. Cook for 1 more hour, or until meat is tender and bones appear loose when moved. Time may vary depending on size of slab. Let meat rest for 30 minutes before slicing. 

Calories: 554, Fat: 33 g (13 g Saturated Fat), Cholesterol: 114 mg, Sodium: 2483 mg, Carbohydrates: 12 g, Fiber: 1 g, Protein: 52 g.