Preheat oven to 350F degrees.
Combine the blackberry preserves, apple juice and mustard in a bowl, and combine. Set aside half of the mixture.
Trim fat and rind from the ham. Score outside of ham in a diamond pattern. Place ham on a pan coated with cooking spray. Bake ham for 1-1/2 hours or until a thermometer reaches 140F. Baste the ham with the preserve mixture every 20 minutes as the ham bakes.
Remove ham from oven, cover and let stand for 15 minutes. To let the ham sit after baking allows the juices to set into the ham to create the fullest flavor.
Place the preserves mixture that was set aside into a large skillet over medium-low heat. Cook for 15 minutes until the mixture has reduced. Serve this beautiful sauce with the ham.
Pour a glass of Monticello wine and eat with ham.