THAW pastry at room temperature 20 min. Preheat oven to 350°F. Unfold pastry. Using 2-inch heart shaped cookie cutter, cut each sheet into 12 hearts. Place on ungreased baking sheets. Bake 20 min. or until golden brown. Remove from baking sheets; cool completely on wire racks. Split each heart in half horizontally.
POUR half-and-half and liqueur into medium bowl. Add dry pudding mix. Beat with wire whisk 2 min. or until well blended. Refrigerate 10 min.
SPREAD about 1 tablespoon of the pudding mixture onto bottom half of each heart; top with remaining pastry halves. Stir hot water into powdered sugar to make a thin glaze. Spread on top of hearts. (If glaze becomes too thick, add more hot water until reaching desired consistency.) Before glaze dries, drizzle chocolate on top to form thin lines. Draw wooden pick through chocolate to make design.