Maple Creme Fraiche Tart

Name: Maple Creme Fraiche Tart
Ingredients: Dough for 9-inch tart pan or 14x 4.5 rectangular pan*; 1 cup AP flour; 1/2 cup fine cornmeal; 8 tablespoons cold unsalted butter, cut into small cubes; 1/2 teaspoon fine sea salt; 1/2 tablespoon sugar; small glass ice water; Maple Cream Filling; 1 cup heavy cream; 1/2 cup creme fraiche; 3/4 cup grade B maple syrup (B is key here); 3 large egg yolks, room temperature; 1 vanilla bean; 1/4 teaspoon fine sea salt