1Preheat oven to moderate, 180 C. Place wire rack in roasting dish big enough to fit ham.
2GINGER & MUSTARD GLAZE In a small saucepan, stir all ingredients on medium heat until sugar dissolves. Reduce heat to low. Simmer 10 mins. Cool.
3Score a diamond pattern about 5-mm deep all over ham fat.
4Place ham on rack (if shank overhangs, wrap in foil) and pour 1 cup water into base of dish.
5Brush one-third glaze over ham. Bake 45 mins, brushing and basting with glaze and pan juices.
6Remove ham from oven and rest 15 mins. Garnish with watercress and carve into slices to serve.
Photo: Rob Shaw/BauerSyndication.com.au