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1
Heat currants, maple extract, and 1 tablespoon water in a saucepan over low heat until currants are soft, about 5 minutes. Set aside to cool to room temperature, about 10 minutes.
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2
Preheat oven to 450 degrees F (230 degrees C). Spray 24 muffin cups or individual tart pans with cooking spray.
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3
Whisk flour and 1 teaspoon salt together in a large bowl. Cut in shortening and cold butter with a knife or pastry blender until the mixture resembles coarse crumbs. Add ice water, 1 tablespoon at a time, tossing with a fork, until flour mixture is moistened. Do not add more water than you need: when you squeeze a handful of the moistened pastry mixture, it should form a ball. Divide dough in half and shape into balls.
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4
Roll out one half of dough on a lightly-floured surface. Cut tart shells out of dough with a 3 1/2-inch circular cutter, and press into prepared tins. Repeat with the remaining dough. Cover tins; set aside.
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5
Heat brown sugar, 2/3 cup butter, cream, and vanilla over low heat until smooth, stirring occasionally; remove from heat. Whisk a few spoonfuls of the warm butter mixture into beaten eggs, then whisk egg mixture into the butter mixture.
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6
Divide the currants, along with their liquid, into the bottom of the prepared tart shells. Fill each shell about 3/4-full with butter mixture. Place a pecan half on top of each tart.
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7
Bake tarts in the preheated oven for 8 minutes. With oven door closed, reduce temperature to 350 degrees F (180 degrees C); continue baking until filling is bubbly, about 10 minutes. Remove from oven; allow to cool for a few minutes before loosening tarts from pan with a knife. Remove tarts to cool completely on a wire rack.
