Melted butter. Quarter potatoes & boil for 15 mins until tender. Place potatoes in a bowl and mash. Boil cabage for 10 minutes, drain well. Melt butter in a large pan. Add cabbage and spring onion and cook for 60 seconds. Add cabbage mixture to bowl of mash and add milk gradually until a creamy consistency has been achieved. Season with the ground black pepper and serve. May be garnished with chopped parsley and/or extra melted butter.