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Preheat oven to 350°F.
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Cream shortening and butter together by hand or with electric mixer. Sift in flour and salt. Mix until crumbly. Stir in enough cold water to make a soft dough. Knead together for 30 seconds or until dough comes together.
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Roll dough out between two sheets of parchment or waxed paper, until 1/8-inch thick. Cut into 4-inch circles to fit muffin pans. Ease into muffin pans. Chill for 30 minutes.
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Cream together butter, sugar and salt. Add vinegar, vanilla, eggs and corn syrup. Don't over-mix. Chill for 30 minutes. Stir together before filling tarts.
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Fill each pastry shell with 1 tsp raisins. Spoon about 1/4 cup syrup mixture into every cup. Bake for 25 to 30 minutes. Cool in pans on a rack. The tarts take approximately 2 hours to set; refrigerate to speed up the process. With a small, sharp knife cut around tarts and ease out of tins.