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Put the flour and salt in a bowl. Rub in the butter with your fingers until the mixture becomes like damp sand in texture. You can also use a food processor.
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Add the egg, mix well, then work very briefly with your hands until the dough holds together in a soft ball, adding a little milk if necessary. Wrap the dough and refrigerate for 1 hour.
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Before using, allow to warm up and soften a little.
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Grease an 11 inch tart pan. Line the bottom and sides with the dough by pressing lumps of dough into place with your hands and smoothing the seems. Brush with the egg white and prick with a fork.
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Bake in a preheated oven at 350° for 20 minutes until lightly browned. Let cool.