Marmalade and ginger-glazed ham

Name: Marmalade and ginger-glazed ham
Prep time: 15 min
Cook time: 4 h
Total time: 4 h 15 min
Cuisine: European, British
Ingredients: 3 kg (8lb) gammon joint on the bone or 3kg (6½lb) off the bone; 1 large onion, quartered; 7 1/2 cm (3in) fresh root ginger, thickly sliced; 2 bay leaves; 12 peppercorns; 1 L (1¾ pints) cider or apple juice; 1 orange, thickly sliced; ½ tbsp ground ginger; 3 tbsp. marmalade; Whole cloves for studding the ham