01 - Preheat oven to 350°F. Grease a 9-inch tart pan with removable bottom.
02 - Combine flour, sugar, and salt in a large bowl. Rub in cold butter with fingertips until mixture resembles coarse crumbs.
03 - Add egg yolk and 2 tablespoons ice water. Mix gently until dough forms, adding extra water if necessary.
04 - Shape dough into disk, wrap in plastic, and refrigerate for 30 minutes.
05 - Roll dough on floured surface and line tart pan, trimming excess. Prick base with fork.
06 - Line crust with parchment, add baking weights, and bake 15 minutes. Remove weights and bake 10 minutes more until lightly golden. Cool slightly.
07 - Whisk eggs, sugar, and cornstarch until smooth in a medium bowl.
08 - In saucepan, heat milk and cream to just simmering. Slowly whisk into egg mixture, stirring constantly. Add vanilla extract.
09 - Pour custard into pre-baked crust.
10 - Bake 20 to 25 minutes until custard is set but slightly wobbly in center.
11 - Allow tart to cool completely, then refrigerate at least 2 hours before serving.