Preheat the oven to 325 degrees F (170 degrees C). Arrange tart shells on a baking sheet.
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Beat sugar, butter, and eggs together in a large bowl with an electric mixer until creamy.
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Stir in raisins, walnuts, and cream until thoroughly combined. Spoon batter into tart shells, no more than half full.
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Bake tarts in the preheated oven until pastry is golden and filling is set, 20 to 25 minutes. Allow tarts to cool on a wire rack.
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