Rum Raisin Carrot Cake With Cream Cheese Frosting

Ingredients

• 1 cup raisins
• 1/2 cup dark rum
• 1 cup walnuts, chopped
• 2 cups all-purpose flour
• 2 teaspoons baking powder
• 2 teaspoons baking soda
• 1 teaspoon cinnamon
• 1 teaspoon salt
• 1 cup vegetable oil
• 1/2 cup buttermilk
• 1 1/2 teaspoons pure vanilla extract
• 4 large eggs
• 2 cups sugar
• 1 pound carrots, peeled and coarsely shredded
• 2 sticks unsalted butter, softened
• 28 ounces cream cheese, softened
• 1 tablespoon pure vanilla extract
• zest of one orange
• 2 cups powdered confectioners' sugar
• 1/2 cup chopped walnuts for garnish (optional)