Ingredients

  • 1 cup unbleached all-purpose flour
  • 14 teaspoon baking soda
  • 3 tablespoons cocoa powder
  • 14 cup sugar
  • 4 tablespoons butter
  • 1 large egg
  • 2 cups hazelnuts (The already buttery flavor of the hazelnuts pairs them naturally with the chocolate filling. Walnut)
  • 4 ounces bittersweet chocolate or 4 ounces semisweet chocolate
  • 4 tablespoons butter
  • 1 cup dark corn syrup
  • 12 cup sugar
  • 3 eggs
  • 1 pinch salt
  • 2 tablespoons dark rum (optional)

Method

  • Mixing the Dough:
  • Sift the dry ingredients together three times.
  • Rub in the butter and moisten with the egg as for Sweet Pastry Dough.
  • Shape into a disk, wrap, and refrigerate.
  • Cooking the Chocolate-Hazelnut Filling:
  • Place the hazelnuts on a baking pan and toast at 350 degree F until the skins are loose and come off easily, about 10 minutes.
  • Rub the hazelnuts in a towel to remove the skins.
  • Chop the hazelnuts coarsely, by hand or with a food processor.
  • Combine the chocolate with the butter in a small bowl.
  • Bring a small pan of water to a simmer and turn off the heat.
  • Place the bowl of chocolate and butter over the hot water and stir to melt.
  • Combine the corn syrup and sugar in a small saucepan.
  • Bring to a full rolling boil over medium heat.
  • Remove from heat and stir in the chocolate mixture.
  • Beat the eggs and salt with the optional rum.
  • Beat in the chocolate mixture, taking care not to overbeat.
  • Assembling:
  • Lightly flour the work surface and dough.
  • Roll the dough to a 14-inch diameter disk, 1/8 inch thick.
  • Line a 10-inch tart pan with the dough, trimming away the excess.
  • Stir the chipped hazelnuts into the filling and pour the filling into the pan.
  • Baking:
  • Bake at 350 degree F until the filling is set and the crust is baked through, about 40 minutes.
  • Holding:
  • Store the tart at room temperature up to 2 days.