Apple Crumble Tart

"Very fancy and delicious, this tart 's fillings are baked in puff pastry. Apples are sliced, piled onto a large round of pastry and covered with a sweet ground almond crumb mixture. After it 's baked and while still warm, a wonderful sherry sauce is poured over this lovely tart."

Ingredients:
1/2 (17.5 ounce) package frozen puff pastry, thawed
1 tablespoon butter, melted
3 apple - peeled, cored, and chopped
3/8 cup all-purpose flour
3/8 cup chopped blanched almonds
1/2 cup white sugar
1/4 teaspoon ground cinnamon
3 tablespoons butter, chilled
1/4 teaspoon vanilla extract
3 egg yolks
3 tablespoons white sugar
1/3 cup dry Marsala wine

Directions:
1.In a small bowl, mix flour, almonds, 1/2 cup sugar, and cinnamon together. Add chilled butter and vanilla extract. Cut together with a pastry blender until small crumbs form.
2.Unfold pastry and cut into a 10 inch circle. Place on a large, ungreased baking sheet. Brush with melted butter or margarine. Arrange apples in the center of the pastry, leaving a 1/2 inch wide border of pastry. Spoon almond topping gently over the apples, being careful it doesn't spill over the edges of the pastry.
3.Bake at 350 degrees F (175 degrees C) for 30 minutes, or until golden brown.
4.Place egg yolks and 3 tablespoons sugar in the top of a double boiler over simmering water. Beat mixture constantly with a portable electric mixer. When foamy, add the marsala; continue to beat until the mixture begins to thicken. Do not overcook, or the mixture will curdle. Remove from heat. Serve warm over the apple crumble.

The sauce to serve over this sounds very interesting.