Bittersweet Chocolate Basil Tart with Honey Grapefruit Sauce

Pastry

 * 6 tablespoons (¾ stick) butter, softened
 * ¼ cup sugar
 * 1¼ cups cake flour (not self-rising)
 * 1 egg

Filling

 * 1 cup heavy cream
 * ⅓ cup whole milk
 * ½ cup loosely packed, finely shredded basil leaves
 * 8 ounces bittersweet chocolate, chopped
 * 1 egg
 * confectioners' sugar
 * sprig fresh basil

Honey grapefruit sauce

 * 3 pink grapefruits, peeled and cut into segments, saving juice
 * 3 tablespoons honey
 * 1½ teaspoon cornstarch mixed with 2 teaspoons water

Pastry

 * 1) In the bowl of an electric mixer fitted with a paddle attachment, beat butter and sugar until light and fluffy.
 * 2) With mixer on low speed, add flour and egg in two parts and beat just until combined.
 * 3) Shape dough into a disk, wrap in waxed paper, and chill 1 to 24 hours.
 * 4) Roll out dough on a lightly floured surface with a lightly floured rolling pin to ⅛- to ¼-inch thickness.
 * 5) Transfer to a 9-inch tart pan, press in sides and bottom, and trim any excess dough around edges.
 * 6) Preheat oven to 350°F.
 * 7) Cover dough with a large piece of foil and weigh down with uncooked rice or beans.
 * 8) Bake 20 minutes, remove foil and beans, and bake 10 minutes longer, or until light golden brown.
 * 9) Cool on a rack.

Filling

 * 1) Preheat oven to 375°F.
 * 2) In a medium saucepan over medium heat, bring cream, milk, and basil just to a boil.
 * 3) Remove pan from heat, cover, and steep 10 minutes.
 * 4) Place chocolate in a medium bowl.
 * 5) Pour cream mixture through a strainer over chocolate and whisk until smooth.
 * 6) Let cool 10 minutes, then whisk in egg.
 * 7) Pour chocolate into tart shell and bake 20 minutes or until filling is just beginning to set.
 * 8) Remove to a wire rack and let cool completely.
 * 9) Dust with confectioners' sugar and garnish with basil sprig.

Honey grapefruit sauce

 * 1) Meanwhile chop grapefruit segments into small pieces, saving juice.
 * 2) In a medium saucepan over medium heat, bring fruit, reserved juices, and honey to a boil.
 * 3) Add cornstarch mixture and boil 1 minute or until slightly thickened.
 * 4) Remove from heat, transfer to a bowl, and let cool to room temperature.