INGREDIENTS
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1 lemon
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2 1/2 c. all-purpose flour
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3/4 c. granulated sugar
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1 tsp. ground cinnamon
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1/2 tsp. Kosher salt
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1 c. (2 sticks) butter, cut up and cold
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2 tsp. vanilla extract
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4 c. fresh blueberries
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1/2 c. brown sugar
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2 tbsp. cornstarch