*Do I need to soak mussels before cooking them?
Live mussels are probably still full of sand and grit, unfortunately. So it's best if you soak them before you move on to the cooking process. Really, it just takes a quick soak in fresh water for 20 minutes or so. During this time, the mussels will filter in the fresh water and expel the sand they're holding inside. After 20 minutes, they'll have a lot less grit and salt inside and will be much more comfortable to eat.