FOR THE CAKE:
- 2 cups water
- 3/4 cup raisins
- 1/2 cup vegetable oil
- 2 cups all-purpose flour
- 1 cup granulated sugar
- 1 1/2 teaspoons pumpkin pie spice
- 1 teaspoon baking soda
- 1/2 teaspoon fine salt
- 1 large egg, lightly beaten
- 3/4 cup walnuts, very finely chopped (optional)
FOR THE FROSTING:
- 8 ounces cream cheese, room temperature
- 1/4 cup unsalted butter, room temperature
- 2 1/4 cups powdered sugar
- 1/4 teaspoon fine salt