"You know the smooth, dense white icing in store-bought sandwich cookies? This is a homemade version, perfect for filling our Chocolate Wafer Cookies...."
INGREDIENTS
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1 2 1/2 cups confectioners' sugar or glazing sugar
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1 1/2 cup vegetable shortening
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1 pinch of salt
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1 1 teaspoon vanilla extract
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1 2 teaspoons cold water, or enough to make the filling cohesive