Cooking mussels involves steaming them. This is a popular method of preparing mussels as it helps to bring out their flavor and texture. Steaming mussels requires adding liquid such as water, wine, or broth to the pot, then bringing it to a boil before adding the mussels. The mussels should be cooked until they open, which usually takes about 5 minutes. Once cooked, the mussels can be served with a variety of sauces or accompaniments.