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Set aside an ungreased 8 or 9-inch round tart pan (with a removable base).
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In the bowl of a mixer, combine butter, sugar, and salt. Mix on medium-high speed until smooth and fluffy, about 3 minutes. Add egg yolk and mix on medium-low until thoroughly incorporated. Add all-purpose flour and mix on low speed until the dough starts to come together and resembles wet sand.
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Remove the dough from the bowl and gently pat it into a disc. Wrap in plastic wrap and refrigerate for at least 1 hour (the dough may feel very wet; rest assured that it will come together).
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On a generously floured work surface, roll out dough to a 11-inch circle. Fit dough into the tart pan, and use a sharp knife to trim the crust. Use excess dough to patch any tears of holes in the crust. Prick the dough all over with a fork and refrigerate until firm, at least 30 minutes.
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Line the chilled tart shell with a round of parchment paper, leaving a 1-inch overhang. Fill with pie weights or dried beans. Bake for 15 minutes, then remove pie weights and parchment. Return tart shell to oven, and continue baking until golden brown, about 15 to 20 additional minutes. Remove from oven and cool completely before removing from pan.