Make this heavenly dessert up to 1 week before your party. After it is frozen, cover it tightly with foil.
Draw a 1-inch heart on paper; cover with a piece of waxed paper. In small bowl, combine 1/4 cup semi-sweet chocolate chips and 1 teaspoon shortening. Microwave on Medium 30 seconds to 1 minute to melt; stir. Place melted chocolate in small plastic bag; snip one corner to make very small opening. Pipe chocolate in heart shape, tracing pattern. Refrigerate until set. Remove from waxed paper. Hearts can be covered and frozen until ready to use.