1/2 cup butter, softened
1/2 cup unsalted butter
1 1/2 tablespoons unsweetened cocoa powder
1/2 teaspoon salt
1 1/2 teaspoons vanilla extract
1 cup all-purpose flour
1/2 teaspoon baking soda
Preheat the oven to 350 degrees F (175 degrees C). Sift together the baking soda and water to make 1 cup of pie dough. Add 1/2 cup of cocoa, just enough to cover.
On a lightly floured surface, roll the dough into a 6 inch diameter rectangle. Cut in the butter/sugar towards one end. Cut into squares (be sure to cut all the way through the butter/sugar) and insert models in the center of the holes to keep them fresh. Place them on ungreased cookie sheets. Roll the remainder of the dough into a 1/2 inch thick.
Bake for 45 to 50 minutes in the preheated oven, or until a toothpick inserted into the center of the cookie comes out clean. Cool completely on baking sheets (you can reserve left over dough from the cookies). Serve warm or at room temperature.