INGREDIENTS
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1 ten and a half inch tart pan with a removable bottom (or a pie pan)
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11/4 cup all-purpose flour
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1/4 rounded teaspoon salt
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1/2 cup ground walnuts
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1/2 cup plus 11/2 tablespoons unsalted butter at room temperature
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1/4 cup sugar
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1/2 teaspoon vanilla extract
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12 ounces Mascarpone
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2 tablespoons plus 1 teaspoon sugar
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4 cups fresh blueberries rinsed and dryed
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2 tablespoons cornstarch dissolved in two tablespoons of warmish water
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2 tablespoons fresh lemon juice
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1/3 cup sugar
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2 tablespoons water
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pinch of salt
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Zest from 1/2 a lemon (optional)