Ingredients

  • 6 tablespoons unsalted butter, at room temperature
  • 105 grams (1/2 cup) sugar
  • 45 grams (3 tablespoons) brown sugar
  • 1 1/2 teaspoons salt
  • 1/4 teaspoon plus 1/8 teaspoon baking powder
  • 1/4 teaspoon baking soda
  • 1 teaspoon instant coffee powder
  • 1 1/2 teaspoons vanilla extract
  • 2 large egg yolks
  • 15 grams (3/4 cup) sifted all-purpose flour or rice flour
  • 85 grams (1 cup) sifted cocoa powder, plus more as needed
  • 4 tablespoons shortening or unsalted butter, at room temperature
  • 145 grams (1 1/4 cups) sifted confectioners sugar
  • 1 teaspoon vanilla extract
  • 18 teaspoon salt.

Method

  • For the cookies: Using a mixer, cream together butter, sugar, brown sugar, salt, baking powder, baking soda, coffee powder and vanilla extract.
  • With mixer still running, add egg yolks one at a time.
  • Stop mixer and scrape bowl with a rubber spatula.
  • Add flour and 1 cup cocoa, and resume mixing at low speed until the mixture is crumbly and uniformly blended.
  • Scrape the bowl and knead the dough lightly to form a smooth ball.
  • Transfer to a work surface and flatten into a disk.
  • The dough may be rolled right away or wrapped in plastic and refrigerated for up to a week; bring to room temperature before rolling.
  • Heat oven to 350 degrees.
  • Lightly sift some cocoa powder onto a work surface, and roll the dough to .125-inch thickness.
  • Slide a metal spatula under the dough to prevent it from sticking.
  • Using a 2-inch round cookie cutter, cut out cookies and transfer to an ungreased baking sheet.
  • The cookies will not spread during baking so may be placed close together.
  • Knead and reroll the dough scraps to make more cookies.
  • To add texture to the cookies, place any remaining dough in a mixing bowl.
  • Mix with enough hot water until the dough has thinned into a paste.
  • Transfer to a piping bag fitted with a very small tip, or a heavy duty Ziploc bag with a tiny hole poked in the corner.
  • Pipe a design on each cookie; a tight cornelli lace design gives the impression of an Oreo.
  • Bake the cookies until firm, about 12 minutes.
  • Remove from heat and cool completely on a rack.
  • For the filling: Using a mixer, cream together shortening or butter, confectioners sugar, vanilla and salt.
  • Beat on medium speed for 5 minutes, scraping the bowl periodically.
  • The long mixing time smoothes, whitens and aerates the filling.
  • For assembly: Using a pastry bag fitted with a plain tip or a spoon, place 1 teaspoon (or more if desired) of filling directly onto the center of the undersides of half the cookies.
  • To finish, top with remaining wafers and press down with your fingers, applying very even pressure so the filling will spread uniformly across the cookie.
  • Place cookies in an airtight container and refrigerate for several hours before serving.