This has amazed our guests for years, but is so easy it leaves me time to enjoy their company! And sometimes hubby and I just have it together with a very oaky Chardonnay. The use of unsalted butter is imperative for this recipe, else it is way too salty! This serves 4 for a pretty filling appetizer or 2 for a meal with a salad. You can use clams instead of mussels if you wish. There will be plenty of broth to soak up with a nice crusty bread.