Butter 2 x 8" spring form pan or cake pans and line the bottom with parchment paper. Pre-heat the oven to 350°F (176°C).
Sift flour, sugar and salt together in a large mixing bowl and add the vanilla. Cut the butter into small pieces and rub or cut it into the flour using your fingertips or utensil, just until the dough begins to hold together, being careful not to work the dough too much.
Divide in half and press the mixture into the prepared pans and lightly brush the tops with some of the beaten egg.
Place the pan just below the middle of the oven and bake for 20-22 minutes, it should be golden brown and just set.
Allow to cool completely in the pans. Serve in thin slices- it is rich!
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