Heavenly Chocolate Pistachio Truffles

1. Homemade candy is part of the holiday celebration at our home that the family always looks forward to enjoying these special treats! Melt butter, stir in cocoa; cool.
2. In a large mixer bowl, combine cocoa mixture with sugar; gradually add cream and vanilla, blending well.
3. Chill until firm.
4. Shape small amounts of mixture into 1-inch balls.
5. Roll balls, one at a time, in pistachio nuts, coating until well covered.
6. Cover and chill until firm.
7. Makes about 3 1/2 dozen truffles.