While you could beat the butter by hand, an electric mixer makes the job so much quicker. When chopping up the walnuts, you can use a food processor or even just put them in a plastic bag and pound them with a meat tenderizer or rolling pin (that's what I did).
Calories: 3265kcal | Carbohydrates: 373g | Protein: 28g | Fat: 187g | Saturated Fat: 117g | Polyunsaturated Fat: 8g | Monounsaturated Fat: 48g | Trans Fat: 7g | Cholesterol: 488mg | Sodium: 3795mg | Potassium: 348mg | Fiber: 7g | Sugar: 178g | Vitamin A: 5679IU | Vitamin C: 2mg | Calcium: 108mg | Iron: 12mg