Bittersweet Chocolate Basil Tart with Honey Grapefruit Sauce

Ingredients

• (3/4 stick) butter

  softened
  6 tablespoons
• Sugar
  1/4 cup
• cake flour (not self-rising)
  1 1/4 cups
• egg
  1 unit
• heavy cream
  1 cup
• whole milk
  1/3 cup
• loosely packed

  finely shredded basil leaves
  1/2 cup
• bittersweet chocolate

  chopped
  8 ounces
• egg
  1 unit
• Confectioners' Sugar
  1 unit
• fresh basil
  1 Sprig
• pink grapefruits

  peeled and cut into segments, saving juice
  3 unit
• honey
  3 tablespoons
• cornstarch mixed with 2 teaspoons water
  1 1/2 teaspoon