1. Carefully melt chocolate in microwave, stir until smooth and set aside to cool a bit.
2. Mix together goat cheese, confectioners' sugar, vanilla extract and lemon extract if using.
3. Beat until light and fluffy.
4. Add melted chocolate, combine well and chill, covered, for 1 hour or until firm.
5. Form heaping teaspoons of the mixture into balls and roll the balls in the cocoa powder.
6. Chill on wax paper lined baking sheet 30 minutes or until firm.
7. Keep the truffles in an airtight container, chilled, for up to 3 days.