This is a family fav, much requested around the holidays. Don't be intimidated by the prep time, most of that is just the resting period. Feel free to sprinkle w/ a dusting of powdered sugar before serving.
Preheat oven to 325 degrees. Grease and flour one 10 inch Bundt pan. Sprinkle walnuts over the bottom of the pan.
Mix together the yellow cake mix, 1/2 cup dark rum, eggs, 1/2 cup cold water, cooking oil and instant vanilla pudding. Pour batter over nuts.
Bake at 325 degrees F for 1 hour or until a toothpick inserted into cake comes out clean. Remove cake from oven once done LEAVE IN PAN! Poke holes into the cake so the glaze can soak in and set aside.
To Make Glaze: Melt the butter in a saucepan. Stir in 1/8 cup water and sugar. Boil for 3-5 minutes, until dissolved stirring constantly. Remove mixture from heat and stir in rum. Drizzle over cake evenly and allow to sit at LEAST 2hrs before inverting onto a serving platter. Hope you enjoy!