This might be what you're looking for:
DUTCH LETTERS
Before purchasing the almond paste, check the ingredients listed on the package. Select a brand that is made only with almonds and sugar, not corn syrup or fructose. Otherwise, the filling may soften and leak out of the pastry during baking.
2 - 17 1/4-oz. pkg. (4 sheets) frozen puff pastry
1 slightly beaten egg white
1 8-oz. can almond paste
1/2 cup granulated sugar
1/2 cup packed brown sugar
Granulated sugar
Thaw the frozen puff pastry according to package directions.
For filing, in a small mixing bowl stir together egg white, almond paste, 1/2 cup granulated sugar, and brown sugar. Set aside.
On a well-floured surface, roll each sheet of thawed puff pastry into a 12 1/2x10-inch rectangle. Cut each rectangle into five 10x2 1/2-inch strips.
Shape a slightly rounded tablespoon of almond filling into a 9-inch-long rope. Place the almond rope down the center third of one strip. Roll up the strip lengthwise. Brush the edge and ends with water; pinch well to seal. Repeat with the remaining dough strips and filling.
Place the filled strips, seam side down, on an ungreased baking sheet, shaping each strip into the shape of a letter. Brush with water; sprinkle with additional granulated sugar. Bake in a 375 degree oven for 20 to 25 minutes or till pastry is golden. Remove pastries from the baking sheet. Cool completely on wire racks. Makes 20.
To freeze: Place the cooled, baked letters between layers of waxed paper in an airtight freezer container. Seal, label, and freeze for up to 3 months. To thaw, let pastries stand, uncovered, at room temperature for 30 minutes.
From: Better Homes & Gardens, Jan, 1995
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Also, you might wish to check out the following site:
Almond Banket "Yes, it is spelled Banket – an almond filled pastry from Holland."
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Hope this helps. Good luck!