Preheat oven to 400F. Sprinkle raisins evenly in baked shells. In bowl, cream together butter and sugar; beat in corn syrup, egg, vinegar, vanilla and salt. Pour into pastry shells, filling each 3/4s full.
Bake in 400F oven for about 10 minutes or just till runny in centre. Let cool in pan for 1 minute, remove to rack and let cool completely.
