Whisk all ingredients together in a saucepan until smooth. Heat over medium to medium-low heat until simmering. Simmer for 2 minutes and remove from heat.
When ham is heated through, remove aluminum foil covering and pour or brush glaze over the top to cover completely.
Raise temperature to 400°F. Return the ham to the oven and cook uncovered for 20 minutes or until glaze is caramelized and bubbly. Let rest for 10 minutes before slicing.