Cut butter into powdered sugar, flour and salt, as you would a pie crust. Butter a 9 x 13 inch pan. Pat the crust into the pan and bake at 350 for 20 minutes. Blend eggs, sugar, and lemon juice in a blender. Spread on top of the crust. Bake at 350 for 30-40 minutes until it is set or browns slightly. Sprinkle with powdered sugar and cut when it is cool.
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