Rum Cake

Name: Rum Cake
Prep time: 20 min
Total time: 20 min
Cuisine: American
Ingredients: Cooking spray; All-purpose flour; 1 c. chopped walnuts; 1 box yellow cake mix; 1 (3.4-oz.) package instant vanilla pudding; 4 large eggs; 1/2 c. (1 stick) butter, melted and cooled slightly; 1/2 c. water; 1/2 c. dark rum; 1/2 (1 stick) butter; 3/4 c. granulated sugar; 1/3 c. dark rum; 1/4 c. water