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Slice the potatoes and the onion. Layer in a greased metal pan (or in foil). Top with pats of butter.
Mix cheddar cheese, parsley, and Worcestershire sauce. Top the potato layers. Cover tightly with foil.
Place on grill set to low (or 350 - 400 degrees Fahrenheit). Grill for 35 to 40 minutes.
Serving: 1cup | Calories: 417kcal | Carbohydrates: 61g | Protein: 10g | Fat: 16g | Saturated Fat: 10g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 4g | Trans Fat: 0.5g | Cholesterol: 43mg | Sodium: 267mg | Potassium: 1459mg | Fiber: 8g | Sugar: 5g | Vitamin A: 489IU | Vitamin C: 66mg | Calcium: 146mg | Iron: 3mg