Roasted Garlic and Caramelized Onion Tart

Name: Roasted Garlic and Caramelized Onion Tart
Ingredients: Tart Crust; 1 1/4 cups all purpose flour; 1/2 teaspoon salt; 1/2 teaspoon sugar; 1/4 pound cold unsalted butter (1 stick); 1/4 cup ice cold water; Roasted Garlic and Carmelized Onion Tart; 1 Pie Dough Disc (from recipe); 1 Head of Garlic; 1 anchovy fillet; 1 tablespoon Olive Oil; 1 Large Onion; Salt and Pepper to Taste; 2 ounces Goat Cheese, crumbled; 1/4 cup grated parmesan cheese; 1/4 cup toasted walnuts, chopped; 1 beaten egg white; 1/2 teaspoon Herbs de Provence