In a mini food processor, combine the blackberry preserves, Dijon mustard, and apple juice. Pulse until smooth, about 30 seconds to 1 minute.
Place ham in a roasting pan with about 1/2 inch of water in the bottom. Glaze with a pastry brush and place in the oven to bake at 275°F (135°C) for 15 minutes per pound, glazing every 20 minutes.
Notes
To STORE Blackberry Dijon Ham, place it in an airtight container and refrigerate for up to 5 days. You can also FREEZE it for up to 2 months; wrap it tightly in aluminum foil and place it in a freezer-safe bag.To REHEAT, thaw if frozen, then warm in a 325°F (165°C) oven for 10-15 minutes per pound, covered with foil to retain moisture. You can also microwave individual slices on medium power until heated through.