Truffle Pistachio Hearts

Place chocolate squares, cream and butter in microwave-safe bowl or large measuring cup. Microwave on high power for 4 to 5 minutes, stirring halfway through, or until chocolate is melted. Beat with wire whip until smooth and fluffy. Mix in chopped pistachios. Turn into 8 inch square or 6 x 10-inch pan (or dish) lined with sheet of foil. Chill until firm. Lift chocolate from pan, holding onto foil for easy handling. Cut out heart shapes with small heart cutter, or cut shapes with tip of knife, using a hand-drawn cardboard heart as a pattern. They may soften when being handled, but will firm up again.