- Crust:
- 1 1/4 cups all-purpose flour
- 1 cup whole wheat flour
- 1 cup almond meal
- 1 tablespoon white sugar
- 1 teaspoon lemon zest
- 1/2 teaspoon salt
- 3/4 cup butter
- 3 tablespoons buttermilk
- Filling:
- 10 egg yolks
- 2/3 cup white sugar
- 2/3 cup cornstarch
- 1 quart milk
- 3 sprigs basil
- 1/2 teaspoon vanilla extract
- 15 fresh apricots, pitted and sliced
- 1 cup apricot jam
- Preheat oven to 350 degrees F (175 degrees C).
- Whisk all-purpose flour, whole wheat flour, almond meal, 1 tablespoon sugar, lemon zest, and salt together in a large bowl. Cut in butter with a pastry blender until mixture is in pea-sized crumbles. Stir in buttermilk until dough comes together.
- Press dough evenly over the bottom and 1/2 inch up the sides of a 12×16-inch tart pan.
- Bake in the preheated oven until lightly browned, about 20 minutes. Place pan on a wire rack to cool completely, about 1 hour.
- Whisk egg yolks, 2/3 cup sugar, and cornstarch together in a heavy-bottomed pot. Whisk in milk. Add whole basil sprigs.
- Cook milk mixture over medium heat, whisking constantly, until mixture begins to steam, about 8 minutes. Reduce heat to low. Remove basil sprigs with tongs and discard. Whisk vigorously until custard thickens, about 1 minute.
- Set a wire mesh strainer over a large bowl. Pour custard into the strainer; use a rubber spatula to press it through the strainer into the bowl. Whisk vanilla extract into the custard. Press a piece of plastic wrap directly onto the surface. Refrigerate until cold, about 3 hours.
- Pour cooled custard over crust; spread evenly to edges of crust with a rubber spatula. Arrange apricot slices on top.
- Scoop apricot jam into a small microwave-safe bowl; microwave on high until melted, about 1 minute. Brush jam over apricot slices.