Meanwhile, make the lemon glaze. Melt 1 tablespoon of butter and whisk into powdered sugar. Add the zest of 1 lemon, and just enough lemon juice to make a thick, but pourable glaze, about 1½ - 2 tablespoons. Whisk until smooth and combined.
Pour glaze over shortbread and allow to set before cutting into bars.
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Read more at http://www.kevinandamanda.com/recipes/dessert/brown-butter-frosted-lemon-squares.html#lk8iXAUsJ2FoIEJb.99