The sweet and salty taste of sea urchin and the creamy, mild taste of butter are perfectly balanced. Fresh Hokkaido sea urchin is used as raw material without preservative alum.Butter made from raw Hokkaido milk only.In order to make it rich, we add our own sea urchin miso as a hidden flavor. To give you a taste and flavor of sea urchin, we use more than 30% of the real sea urchin.No additives are used as preservatives.