Slow-Cooked Baby Back Ribs with root beer-chipotle barbecue sauce Recipe

Ingredients

• 3 Tbsp. kosher salt
• 1 Tbsp. each dried oregano, garlic powder, black pepper, chipotle chili powder, and paprika
• 2 racks baby back ribs, (2½–3 lb.), trimmed
• 1 large onion, sliced
• ½ cup root beer
• 1 Tbsp. olive oil
• 1 ½ cups diced onions
• 1 Tbsp. minced fresh garlic
• 1 cup root beer
• 1 ½ cups purchased barbecue sauce (such as Sweet Baby Ray’s)
• ½ cup cider vinegar
• ¼ cup packed dark brown sugar
• 2 Tbsp. minced chipotle in adobo sauce
• 1 Tbsp. Worcestershire sauce
• Salt and black pepper to taste