| 1.  |  Place chocolate in food processor; processuntil chocolate is chopped. | 
  | 2.  |  Combine cream and butter in 1-cup glass measuring cup and microwave at high 1-1/2 minutes or until butter is melted and cream begins to boil. | 
  | 3.  |  With food processor running, pour hot cream mixture through food tube, process until chocolate melts. | 
  | 4.  |  Add liqueur and vodka, process until blended. | 
  | 5.  |  Pour chocolate mixture into medium bowl, cover with plastic wrap and refrigerate overnight. | 
  | 6.  |  Shape chocolate mixture into 1-inch balls and roll in walnuts. | 
  | 7.  |  Store in airtight container in refrigerator. | 
  | 8.  |  Let stand at room temperature 2 to 3 hours before serv |