Place ham in slow cooker.

Score top of ham to make cross-shaped slices.

Push 1 tsp cloves into top of ham.

In a medium sized saucepot, combine oranges slices, orange juice, sugar, ginger and mustard, and the other teaspoon of cloves.

Cook on medium for 5 minutes, until glaze has reduced in half.

Drizzle half of glaze mixture over ham, saving 1/2 the glaze to drizzle as it cooks.

Set slow cooker to high and program for four hours, and cover to cook.

Add more glaze every hour of cooking, and in the last hour, every 25 minutes.

When ham has developed a crunchy, dark brown glaze, remove from pan and serve immediately.

If you would like more crunch to your ham, you can place it under a broiler on high and let sugar crisp for 5-10 minutes (watch closely to make sure sugar doesn't burn.)