Rinse the mussels under cold running water
Scrub the shells and remove the beards
Discard any mussels with cracked shells
Discard any mussels that are open and do not close when tapped
Heat a large pot over medium-high heat
Add butter or olive oil
Add chopped garlic, shallot, or onion if desired
Add white wine, broth, or water
Bring the liquid to a simmer
Add the mussels to the pot
Cover the pot with a lid
Cook for 5 to 7 minutes, shaking the pot occasionally
Remove the mussels as they open
Discard any mussels that do not open after cooking
Add herbs, lemon juice, or seasoning if desired
Serve immediately with bread, pasta, or fries