Thoroughly rinse the mussels in a large bowl of water. Pull out the ‘beards’ and any bits of seaweed.
If any mussels are still open give them a little tap on the side of the bowl.
IMPORTANT!!! If they still don’t close discard them – dead ones are dangerous.
Gently heat the margarine in a large heavy bottomed pan. Add the leek, fennel & garlic and stir for a minute or so but don’t brown.
Add the herbs and the wine, then turn up the heat until it starts bubbling.
Pour in the mussels and give them a good stir to get coated.
Turn down the heat, cover and leave for 2 or 3 minutes.
IMPORTANT!! This time discard any mussels that haven’t opened
Serve in a large shared bowl. Pick out and eat one at a time, slurping from the shell. Use fresh French bread to dip into the juice.