Operabaren is an art nouveau gem located inside the Royal Opera House, serving traditional Swedish cuisine like Swedish Meatballs in Cream Sauce with Potato Puree, Lingonberries, and Pickled Cucumber. But the star dish is Toast Skagen originated by Swedish superchef Tore Wretman. When sailing around Skagen he threw together the ingredients at hand for his crew: egg, oil, shrimp, fish roe, and bread. Wretman turned the egg and oil into mayonnaise, mixed it with the prawns, toasted the bread, and shaped the fish roe into small eggs. The dish has been on the menu of Riche, another Wretman restaurant since 1958.