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In a food processor with a steel blade, mix flour, cocoa, powdered sugar, butter and salt into a crumbly mixture.
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Add the egg and continue to blend until large chunks of sough form. If necessary, and if the dough is too dry and won’t come together – add another 1-2 tablespoons of cold water.
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Transfer the dough chunks to a work surface, combine it with your hands and flatten to a disc shape. Wrap in plastic and cool for about 1 hour in the refrigerator.
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On a floured surface roll out the dough about 3 mm thick and transfer to a lightly greased tart pan to form a crust. Make sure to place the dough so that there will be a straight angle between the sides and the bottom.
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Pierce the crust base with a fork and cool for about 1/2 hour in the freezer.
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Preheat oven to 170 degrees.