Baked Apple Dumpling Pie

Name: Baked Apple Dumpling Pie
Ingredients: 1 3/4 Cup all-purpose flour; 1 Tablespoon sugar; 1/2 Teaspoon salt; 1/2 Cup cold unsalted butter, cut into 1/4-inch pieces; 1 large egg yolk; 3 Tablespoons cold water; 1/2 Cup raisins; 1/2 Cup walnut pieces; 1/2 Cup firmly packed light brown sugar; 1/4 Teaspoon cinnamon; 3 Tablespoons unsalted butter; 3 Tablespoons raspberry preserves; 4 Golden Delicious apples; Light cream or milk, for brushing the pastry; Granulated sugar, for coating the pastry; 2 1/2 Cups Vanilla Custard Sauce (optional), for serving*