Sticky lamb shanks with Parmesan mash

Ingredients

• 6 lamb shanks (or adjust for 1 shank per person)
• 2 onions, peeled and quartered
• 1 whole garlic bulb, halved through the waist
• 2 bay leaves
• 4 tbsp balsamic vinegar
• 1 tsp brown sugar
• 150 ml red wine
• Zest from 1 lemon
• 1/4 cup parsley, finely chopped
• Mash
• 6 agria potatoes, peeled and roughly chopped
• 1 tsp sea salt
• 100 ml cream, warmed
• 100 g Parmesan, grated
• Salt and black pepper, to season