In a large saucepan combine the chocolate, cream, butter and peanut butter and heat over moderate heat, stirring, until chocolate is completely melted.

Remove from heat and stir in vanilla and a pinch of salt.

Transfer to a bowl and chill for 4 hours, or until firm.

Form mixture by heaping teaspoons into balls and roll lightly in peanuts.

Chill on a baking sheet lined with wax paper for 1 hour, or until firm.

Keep in an airtight container, chilled, for up to 2 weeks.