French Truffles - cooking recipe

Ingredients

6 oz. semi-sweet chocolate
2 oz. sweet butter, cut into small bits (1/2 stick)
2 egg yolks
approximately 1/4 tsp. peppermint extract or 1/4 c. rum
unsweetened cocoa powder (preferably Dutch process)
approximately 2 oz. additional semi-sweet chocolate (for coating the finished candies)

Preparation

Break or chop the chocolate into medium size pieces.
Place it in the top of a small double boiler over hot water on low heat. Cover and let stand until partially melted.
Uncover and stir until completely melted.
Remove the top of the double boiler temporarily.
Add the butter, a few pieces at a time and stir with a small wire whisk after each addition until smooth.