I couldn't believe how much we enjoyed this ham. Mix the mustard, horseradish and brown sugar together. Mix in a small amount of cola to form a paste and rub all over the ham. Put the ham in the crockpot and pour the remaining cola over the ham. Cook on high for 1 hour and then set on low for 6-7 hours. The hardest part of this recipe is being able to resist eating it before it gets done as it smells sooooo good. Enjoy..