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1
Preheat oven to 350 degrees F.
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2
In a food processor finely grind almonds with confectioners' sugar and transfer to a large bowl.
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3
In food processor pulse butter with flour until mixture resembles fine crumbs and add to almond mixture with cornstarch and salt, stirring until combined well.
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4
In a small bowl beat together egg and lemon juice until blended and stir into flour mixture until combined well.
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5
Work mixture with hands until it forms a dough.
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6
Pat 1 1/2 cups dough into a disk and chill, wrapped in plastic wrap, 20 minutes.
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7
Pat remaining dough evenly into a 17 1/2 by 11-inch jelly-roll pan and spread evenly with jam.
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8
On a lightly floured surface with a floured rolling pin roll out chilled dough 1/8 inch thick and with a 3/4 to 1 1/2-inch star-shaped cookie cutter (we used 3 different sizes) cut out as many stars as possible.
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9
Re-roll scraps and cut out more stars.
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10
Arrange stars randomly over jam and carefully brush stars with milk.
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11
Sprinkle stars with granulated sugar and bake in middle of oven 30 minutes, or until stars are golden.
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12
Cool confection in pan on a rack and cut into 20 bars.
