3 cups all-purpose flour
1 teaspoon salt
2 cups white sugar
1 teaspoon baking soda
1 1/4 cups vegetable oil
2 teaspoons vanilla extract
3 eggs, beaten
3 1/2 cups chopped apples
1 cup chopped walnuts
 
1 1/4 cups packed brown sugar
1/3 cup milk
1/2 cup butter