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1
Preheat the oven to 375 degrees F.
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2
Cover cookie sheet with parchment or baking paper.
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3
Make the dough.
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4
In a large bowl, cream the butter and sugar together with an electric mixer.
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5
Add the egg yolk and vanilla and beat until light.
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6
Add the flour, a little at a time, and mix until the dough is smooth.
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7
Divide the dough into 4 parts.
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8
On the countertop, use your palms to roll each part into a strand about 3/4 inch thick and the length of the cookie sheet. Place the strands about 2 inches apart on the paper-covered cookie sheet.
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9
With the side of your little finger, press a groove down the center of the length of each strand.
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10
Bake for 10 minutes until the cookies feel firm to the touch. Remove from the oven and spoon or pipe jam into the grooves.
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11
Return to the oven for 5 to 10 minutes or until cookies are very pale golden brown.
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12
To Decorate with icing:
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13
Mix the confectioners' sugar, lemon juice and cream in a small bowl to make a smooth icing.
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14
Drizzle the icing down the length of the hot cookies.
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15
While the cookies are still warm, cut them at a 45 degree angle into 1-inch lengths. Let cool on the baking sheets.
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16
When the frosting is set, transfer to an airtight tin.
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17
Store in a cool place or freeze.
