Molasses-Glazed Cocktail Ribs

Place the vinegar, molasses, maple syrup, mustard, and harissa in a large bowl; mix to combine. Add ribs and let marinate for 1 hour, covered, in the refrigerator.

Preheat oven to 375 degrees. Transfer ribs from marinade to 2 rimmed baking sheets or other ovenproof pan with 1-inch-high sides, reserving marinade. Season ribs with salt and pepper; transfer to oven. Cook ribs for 30 minutes, basting twice with reserved marinade. Discard any remaining marinade and continue cooking until ribs are glazed and cooked through, about 15 minutes more. Serve warm.