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Preheat oven to 325 and place rack in center of oven.
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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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Take dough in segments and press into tart pans. Start with the bottom and then build up the sides, Dough should be about a 1/4" thick all the way around.
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Use a fork to poke holes in the bottom of dough.
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Place tins on a cookie sheet.
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Sprinkle dough with granulated sugar and bake for 25 minutes or until dough is cooked and slightly golden.
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Remove from oven and allow cool completely.
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Fill with mascarpone/lemon curd mixture, top with berries, sprinkle with powdered or course granulated sugar, remove tart from tin and serve. Each tart is enough to serve 2 people.