Plum Galette

Name: Plum Galette
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: Italian, French
Ingredients: 1 cup pastry flour (substitute all purpose flour); 2 tablespoons hazelnut flour (optional); 2 tablespoons granulated sugar; 1/4 teaspoon salt; 6 tablespoons unsalted butter (cold); 2 tablespoons water (cold); 1 egg (beaten for egg wash); 8 large plums (sliced (about 1 pound)); 1/4 cup granulated sugar; 1 tablespoon cornstarch; 1 teaspoon lemon juice; 1/4 teaspoon almond extract; 2 teaspoons fresh thyme; 2 tablespoons toasted hazelnuts (chopped)