"Vanilla Cardamom Shortbread Sandwich Cookies with Espresso Buttercream Filling for the Great Food Blogger Cookie Swap 2013 Makes 3 dozen sandwich cookies..."
INGREDIENTS
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2 cups butter
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1 c confectioners (powdered) sugar
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3 c all purpose flour
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1 c arrowroot ( or corn) starch
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¼ tsp sea salt
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1 tsp ground cardamom
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Vanilla bean seeds from 4 vanilla beans ( 1 ½ tsp vanilla bean seeds)
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1 tsp vanilla extract
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½ cup espresso
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½ cup sugar
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4 egg whites
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1 ½ cup butter (3 sticks)
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¾ c granulated sugar
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½ tsp salt