Whisk all ingredients in a small saucepan and bring to a boil over medium heat. Continue to simmer, stirring frequently for 5-6 minutes. Be extra careful because if the glaze boils over, it will make a mess!
Take saucepan off heat and allow to cool and thicken. When your ham has a ½ hour left in the oven, brush glaze over entire ham and put back in oven for last ½ hour of heating time.