Place the vinegar, water, bay leaves, cinnamon, sugar, rock salt and onion in a large saucepan over high heat. Stir to combine and bring to the boil.
Add the ribs, reduce the heat to medium and cover with a tight-fitting lid. Simmer for 30–40 minutes or until the pork is tender.
Place the bourbon, maple syrup, vinegar, Worcestershire sauce, mustard, paprika and salt flakes in a medium saucepan over medium heat. Stir to combine and bring to the boil. Reduce the heat to low and simmer for 8–10 minutes or until slightly reduced. Set aside.
Preheat oven to 220°C (425°F).
Remove the ribs from the cooking liquid and place, meat-side down, in a large deep-sided ovenproof dish. Top with the glaze and roast for 15 minutes.
Turn the ribs over, baste with the glaze and roast for a further 15 minutes or until the pork is tender and the glaze is reduced. Brush with any remaining glaze and slice to serve.