Marmalade-glazed Ham

Ham

• 1 unsmoked gammon joint, boneless (1.4 kg-1.6 kg)
• 2 ½ Tbsp black treacle
• 1 tsp cloves, plus extra for decoration
• 1 bay leaf
• 1 tsp ground allspice
• 1 Tbsp black peppercorns
• 1 orange, thin peelings of skin only
• water, for cooking gammon

Glaze

• 80 g dark brown sugar
• ½ Tbsp Dijon mustard
• 1 tsp dried rosemary
• 5 juniper berries
• 2 pinches ground cloves
• 2 pinches ground cinnamon
• 30 g runny honey
• 150 g orange marmalade