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Preheat oven to 325 and place rack in center of oven.
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Line an 8x8 glass baking dish with parchment paper.
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Use a paper towel to spread a thin layer of soft butter on paper.
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Using a hand mixer or bowl mixer, mix butter and sugars in a large bowl until well blended.
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Add salt, lemon juice and lemon zest and mix till well incorporated.
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Add flour and mix. At first the dough will crumble and fall apart.
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Remove dough from bowl and set on a cutting board or counter and gently knead with hands until dough forms a ball.
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Place dough in prepared 8x8 baking dish and press till dough is evenly distributed in the pan from edge to edge. Dough will only be about ¼ inch thick.
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Sprinkle dough with granulated sugar and bake for 25- 30 minutes or until dough is cooked and slightly golden.
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Remove from oven and let cool for 10-15 minutes. Cut into bar shapes while still slightly warm. Gently remove first bar with a knife and then use a spatula to remove the rest. Place on a rack to cool.