Chocolate frosting for biscotti

1. In a heavy, small saucepan heat chocolate and butter over low flame until melted.
2. Stiri often.
3. Add powdered sugar and vanilla.
4. Frosti biscotte.
5. For a design, run a fork over the frosting while it"s soft.
6. Let stand until chocolate is set.
7. Keeps well in an airtight container, but then *everything* in hawaii keeps well in an airtight container!.