Concord Grape Jam Tart

Name: Concord Grape Jam Tart
Ingredients: 2 cup all-purpose flour,for dough; 1/4 cup Granulated Sugar,for dough; 3/4 tsp coarse salt,for dough; 8 oz cold unsalted butter, cut into 1/2 inch pieces(2 sticks),for dough; 1/4 cup Ice Water,for dough; 1 1/2 lb Concord grapes, stems removed; 3 tbsp fresh lemon juice; 1 cup Granulated Sugar; salt (to taste); 1 x large egg, lightly beaten; sanding sugar(coarse),for sprinkling; Creme fraiche, for serving