Applebee's Baby Back Ribs (Copycat)

(3) 1 Lb. racks pork baby back ribs - cut in half
1 cup ketchup
1/4 cup apple cider vinegar
3 Tbls. dark brown sugar
3 Tbls. Worcestershire sauce
1 tsp. liquid smoke
1/2 tsp. salt 

Place ribs in a large pot and fill pot with enough water to cover ribs. Bring water to a boil, reduce heat, cover and simmer for 1 hour, or until ribs are fork tender. While ribs are boiling, combine remaining ingredients in a medium saucepan and bring to a boil. Reduce heat and simmer, uncovered, stirring often, for 30 minutes, or until slightly thickened. Place boiled ribs, meat side down, on a broiler pan. Brush with half the sauce mixture and broil 4"-5" from heat for 6-7 minutes. Turn ribs over, brush with remaining sauce, and broil additional 6-7 minutes, or until edges are slightly charred.