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To make the pie crust: In a resealable plastic bag, crush the graham crackers. Transfer the crushed graham crackers into a big bowl and mix in the grated dark chocolate shavings, brown sugar, and melted butter. Line 6 (4-inch) mini pie molds with the crust mixture, making crust about 1/8-inch thick. Bake for 8 to 10 minutes, then cool.
To make the filling: In a bowl, combine egg yolks, fresh pink grapefruit juice, fresh lemon juice, pink grapefruit zest, and lemon zest. Mix and set aside. In a heavy saucepan add: brown sugar, cornstarch, a pinch of sea salt, and water. Bring to a boil over medium heat whisking constantly for 2 to 3 minutes, until the mixture thickens. Slowly whisk in a small portion of this mixture to the egg yolks-citrus mixture. Cook's Note: Be careful not to cook the yolks.
Whisk the egg yolk-citrus mixture back into the pot, reduce the heat to low, add 2 tablespoons unsalted butter and whisk for 8 more minutes, until very thick. Cover and refrigerate the mixture for 3 hours.
Preheat the oven to 375 degrees F.