Melt the butter in a skillet and sauté the fish for 1 minute on each side. Sprinkle on a little salt and black pepper, then pour in the cream. Simmer (do not boil) for 5 minutes. Turn the fish and simmer for another 5 minutes. Place the fish on a serving platter and pour the pan liquid over it. Garnish with parsley or green onion tops. Serve with boiled new potatoes, steamed vegetables, and hot bread.