Simmer the brown sugar, mustard and ham liquid for about 5 to 10 minutes until it thickens slightly.
Take a small container of cold water and drop a spoonful of the glaze into it. Let it cool for a few seconds to congeal together at the bottom, then try to pick it up with your fingers. The sweet spot is where you can just barely pinch and pick up the glaze in the water. This is what the rest of the liquid will be like once cooled.
Now you have a perfect, salty-sweet country ham. All that’s left to do is enjoy. Happy holidays!