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Place the butter in a large skillet, preferably cast iron, and melt it over medium heat. Spread them evenly over the bottom of the skillet and cook them in the butter until they become soft. Mix them in with the potatoes and spread them over the the bottom of the skillet. Press down with the spatula so that the mixture forms a solid hash. Cook it on one side until it becomes brown and crispy. Turn it over, section by section, and press each section down with the spatula. Cook the hash on the other side until it's brown. Add Salt and pepper to taste, and garnish with chopped parsley.
Melt butter in a skillet. Add the potatoes. Add the onions and meat. Brown the hash. Flip the hash. Season the hash.