In a small bowl, add 1/2 cup brown sugar, 3 tablespoons mustard, and the 1/4 cup of bourbon. Stir until well mixed, then add the honey and stir again. I like to make sure the sugar is mixed well before adding the honey. If you taste it and find it needs more sweet, add some additional brown sugar 1 tablespoon at a time. Once completely mixed, set aside for later.