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Several days ahead, preheat oven to 375°. Greases a 9" pie pan, lining the bottom with waxed paper. Butter paper also. In a small bowl, mix nuts, sugar and salt.
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In another bowl, beat egg white to soft peaks. Add to nut mixture, mixing well to moisten nuts.
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Press nut mixture onto the bottom and up the sides of the prepared pie pan. Bake 12-15 minutes, or until light brown.
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With a small spatula, loosten the sides and let the crust cool for 10 minutes. Gently lift crust and pull the waxed paper out.
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Meanwhile, in a medium saucepan, combine coffee granules, 1/2 cup milk and marshmallows and stir over low heat until marshmallows melt.
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Beat egg yolk lightly; stir in a little hot mixture then whisk egg into hot liquid. Cook one additional minute, stirring.
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Refrigerate marshmallow mixture, stirring occasionally, until almost set.
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Fold in whipped heavy cream, and almond extract, mixing until all the cream is incorporated. Turn this mixture into the cooled pie shell.
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Melt the chocolate and 1 tablespoon milk together and drop small spoonsful all over the top of the pie. Make a marble effect by cutting through the chocolate with a cold knife.
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Freeze until firm, then serve.