I often make this simple recipe for mussels simmered in rosé wine

http://ladomestique.com/2012/05/17/cook-in-the-moment-recipe-for-mussels-cooked-in-rose/

First you need to clean the mussels with little stiff brush to remove any sand and whatever could be sticking to them. Then remove the beard by pulling it off. I like to cook mussels very simply in a big pot with sliced fennel,garlic, parsley, onions, tomatoes and a splash of pernod or licorice flavored liquor and 2 cups white wine. Saute everything except the mussels in a little olive oil. Then add the pernod and give it a few minutes for the alcohol to burn off; then add the wine and bring to a boil. Add the mussels and cover for a minute or two. Check that all mussels are opened. If not, discard. Serve in bowls with the broth.