ORANGE FLOURLESS CHOCOLATE CAKE FOR THE REAGAN FAMILY

1 1/2 sticks (3/4 cup) unsalted butter, plus extra for greasing pan
6 oz. bittersweet chocolate
1 cup plus 2 Tbsp. sugar
Zest of 1 large orange
4 eggs plus 2 egg yolks
1/2 cup unsweetened cocoa powder
confectioner's sugar (for dusting)
Candied orange peel and vanilla ice cream (to serve)

Preheat oven to 375 degrees F. Butter and flour a 10-inch round cake pan. Line the bottom of the pan with parchment paper, then butter and flour the parchment paper.

Gently melt the chocolate over a double boiler. Stir the butter into the chocolate to melt and stir until smooth. Remove from the double boiler and whisk the sugar and orange zest into the chocolate mixture. Add eggs and egg yolks and whisk well.

Sift the cocoa powder over chocolate mixture and whisk the batter until totally smooth. Put the batter into the pan.

Bake for approximately 35 to 40 minutes or until the top has formed a good crust. Cool the cake in the pan or a rack for 10 minutes.

Invert the cake onto a serving platter. Dust with confectioners' sugar and serve with candied orange peel and vanilla ice cream.

Adapted from source: All The Presidents' Pastries: Twenty-Five Years in the White House by Roland Mesnier