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To prepare pie crust, in a mixing bowl, combine the graham cracker crumbs, sugar and mashed banana (if using). Mix thoroughly.
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Add the salt, shortening and the butter and mix well.
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Add water as needed 1 tbsp at at time.
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Press the mixture into a 9-inch pie pan. Bake until browned, about 25 minutes.
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Remove the pan from the oven and cool, for about 10 minutes.
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To prepare custard filling, in a mixing bowl, combine the egg yolks, cornstarch, and 1 cup of the heavy cream in your stand mixer. Blend until mixed. Set aside.
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Combine the remaining 2 cups cream, the sugar, and the vanilla in a large heavy-bottomed saucepan over medium heat. Mix to dissolve the sugar and bring to a gentle boil, about 10 minutes. Slowly add the egg yolk mixture, stirring constantly until it thickens, about 5 minutes. Be warned: this mixture must break and look curdled or it will not set up properly and it will be loose.
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Pour it into a bowl and set aside. Let cool completely at room temperature.
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When cooled, pour the mixture into the bowl of an electric mixer fitted with a wire whip. Beat at medium speed to combine the mixture. The mixture should fluff up. If it will not combine, add heavy cream a little at a time and slowly add it to the mixture. Whip until you have a thick and creamy custard.
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To assemble, pour the custard on top of the crust.
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Cover with plastic wrap and chill for at least 4 hours - the custard needs to set.
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Whip up the whip cream by combining 1 cup of the cream, sugar and vanilla in the mixer. Mix on medium to high heat until stiff peaks are formed.
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Top the custard generously. Cut the pie into wedges and serve with a drizzle of caramel sauce. Serve and enjoy!