Ingredients

  • 1 cup toasted whole almonds
  • 1 cup sugar
  • 1 tablespoon all purpose flour
  • 1 teaspoon instant coffee powder
  • 1 large egg white plus 1 tablespoon egg white
  • 2 teaspoons vanilla extract
  • 5 tablespoons whipping cream
  • 2 tablespoons (1/4 stick) unsalted butter
  • 1 tablespoon light corn syrup
  • 1 tablespoon instant coffee powder
  • 6 ounces bittersweet (not unsweetened) or semisweet chocolate, chopped
  • 4 1/2 tablespoons whipping cream
  • 1 1/2 tablespoons light corn syrup
  • 1 tablespoon instant coffee powder
  • 12 ounces imported white chocolate (such as Lindt), chopped
  • 1 1/2 tablespoons sour cream
  • 1 tablespoon unsalted butter, room temperature
  • Whole toasted almonds

Method

  • Preheat oven to 350F.
  • Line 9-inch-diameter tart pan with removable bottom with foil, carefully pressing up sides and into grooves.
  • Brush foil with vegetable oil.
  • Finely grind first 4 ingredients in processor.
  • Add egg white and vanilla and blend until mixture almost forms balls.
  • Press onto bottom (not up sides) of prepared pan, using wet finger-tips as aid.
  • Bake until crust looks dry and feels firm, about 14 minutes.
  • Cool.
  • Bring first 4 ingredients to simmer in heavy medium saucepan, stirring ocassionally.
  • Add chocolate and whisk until smooth.
  • Set aside.
  • Bring first 3 ingredients to simmer in heavy large saucepan.
  • Reduce heat to low.
  • Add white chocolate and whisk until smooth.
  • Remove from heat and whisk in sour cream.
  • Pour 1/2 cup of mixture into small bowl; add butter to mixture in small bowl and whisk until smooth.
  • Set aside for garnish.
  • Drop dark chocolate filling and remaining white chocolate filling alternately by 1/4 cupfuls onto crust.
  • Swirl fillings together using tip of knife.
  • Freeze until firm, about 1 hour.
  • Freeze reserved 1/2 cup white chocolate filling until firm enough to pipe, stirring occasionally, about 5 minutes.
  • Lift tart from pan using foil sides as aid.
  • Peel down foil sides.
  • Turn tart on side and carefully peel foil off bottom of tart.
  • Place tart on platter.
  • Spoon reserved white chocolate filling into pastry bag fitted with medium star tip.
  • Pipe white chocolate mixture around edge of tart.
  • Garnish with almonds.
  • (Can be prepared 1 week ahead; refrigerate.
  • Cover when firm and keep refrigerated.)
  • Let stand at room temperature 30 minutes before serving.