Strawberry Mascarpone Tart with Port Glaze

[Mystery]

For tart shell:
1 1/4 cups all-purpose flour
3 tablespoons granulated sugar
Rounded 1/4 teaspoon salt
7 tablespoons unsalted butter, cut into 1/2-inch pieces
1 large egg yolk
1/2 teaspoon pure vanilla extract
1/2 teaspoon fresh lemon juice
3 tablespoons cold water

For filling:
1 1/2 pounds strawberries (about 1 1/2 quarts), trimmed and halved lengthwise
1/3 cup granulated sugar
3/4 cup ruby Port
1 pound mascarpone (about 2 cups)
1/4 cup confectioners sugar
1 teaspoon fresh lemon juice
1/2 teaspoon grated lemon zest
3/4 teaspoon pure vanilla extract