PLACE raisins in a small bowl and cover with hot water. Let stand about 30 minutes.
PREHEAT oven to 400°F (200°C).
CREAM together the butter, brown sugar, salt and corn syrup. Add egg and vanilla and mix well. Drain the raisins and divide between the tart shells. Pour the creamed mixture over top and bake for 15-20 minutes. The filling will be lightly browned and bubbly. Cool completely before serving.