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1
In a food processor, blitz cookies until they are fully crumbled. Drizzle in melted butter and cream and add salt. Pulse to combine. (Alternatively, place cookies in a large zip-top bag and crush with a rolling pin. Transfer crumbs to a mixing bowl and combine with butter, cream, and salt.) Transfer crumb mixture to a deep-dish 9-inch pie plate. Using your hands or the back of a measuring cup, press crumbs evenly along walls and bottom of pie plate. Set aside.
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2
Fill a medium saucepot with at least 1 1/2 inches water and bring to a simmer. In the bowl of a stand mixer, whisk together eggs, sugar, Fernet Branca, and salt. Place bowl over pot of simmering water. Stirring constantly with a flexible rubber spatula, heat egg mixture until it reaches 165u00b0F (74u00b0C), about 10 minutes.
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3
Remove bowl from heat and place on stand mixer with whip attachment. Whip egg mixture on high until it becomes thick and pale and doubles in volume, about 10 minutes. Reduce speed to low and add peppermint extract and food coloring (if using). Mix to combine and transfer egg mixture to a wide bowl.
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4
In stand mixer bowl (no need to wash it), whip cream until it reaches soft peaks. Gently fold whipped cream into egg mixture. Using a fork, drizzle streaks of melted chocolate over the entire surface of the mint mousse. Set bowl of mousse in refrigerator until chocolate hardens, about 5 minutes. Using a flexible rubber spatula, crack chocolate streaks into 1-inch pieces and fold into mousse. Repeat the chocolate-drizzling and folding procedure until no more chocolate remains. Pour mint mousse into prepared cookie crust and freeze for at least 6 hours, and preferably overnight.
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5
Line a rimmed baking sheet with a Silpat or well-greased piece of aluminum foil. In a 1-quart saucepot, combine sugar with 1/4 cup water. Cover and bring to a simmer over medium heat, about 4 minutes. Remove lid and cook sugar syrup until it becomes a deep golden brown. Remove from heat. Add cocoa nibs and stir to combine. Carefully pour caramel onto lined baking sheet and allow to fully set and cool, about 1 hour.
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6
With a rolling pin, crack caramel into 2- to 3-inch pieces. Transfer pieces to a food processor and pulse until caramel is mostly finely ground. Add molasses, oil, salt, and vanilla and process until combined. With food processor running, slowly drizzle in chilled cream, stopping to scrape down bowl's sides if needed. Transfer mixture to a piping bag fitted with a plain #17 tip and chill for at least 1 hour before piping.
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7
Remove pie from freezer and garnish the top with fudge in a crisscross pattern. Fill a piping bag fitted with a #32 open star tip with whipped cream and pipe along the border. Drizzle the edges with melted chocolate, if desired. Using a knife dipped in hot water, cut pie into 8 to 12 slices and serve with extra fudge on the side.
