Active time: 40 min Start to finish: 5 1/4 hr

　　

Ingredients

Makes about 5 dozen cookies

　　Ingredients for basic butter cookies

　　1/2 cup Dutch-process unsweetened cocoa powder

　　1/2 teaspoon baking soda

　　10 1/2 oz fine-quality bittersweet chocolate (not unsweetened), melted and cooled

　　Garnish: salted roasted pistachios, finely ground; Demerara sugar

　　

Step 1

Follow recipe for basic butter cookies, mixing in cocoa, baking soda, and melted chocolate after adding flour (dough will be stiff). Form dough into a 14-inch log (2 inches in diameter) on a sheet of plastic wrap and roll up dough. (Dough will be hard to slice and may crumble.)

　　

Step 2

If garnishing, roll edges of each slice first in pistachios and then in Demerara sugar.