Mussels have amazing nutritional properties. Remember that a steak or two is equivalent in protein to just over a dozen mussels. Inside the large, solid shell there is vitamin A, C, B-12, omega-3, zinc, selenium, phosphorus, sodium, potassium. Other shellfish may even be more sought after. The mussel doesn't mind and waits in the great patience of its shell. If you didn't go for dinner yesterday or lunch today, it'll wait for your snack time, for a glass of beer or white wine, for a circle of friends, for lively conversation.