""Butter tarts with a chocolate surprise!"..."
INGREDIENTS
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12 (3 inch) unbaked tart shells
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4 (1 ounce) squares unsweetened baking chocolate (such as Baker's®), divided
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3/4 cup lightly packed brown sugar
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1/4 cup corn syrup
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1 egg
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2 tablespoons butter, softened
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1 teaspoon white vinegar
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1 teaspoon vanilla extract
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1 pinch salt