Cover the pan and let them cook for half and hour in the steam until the shells open. 

Shake the pan and see if all the mussels are open. 

Take them out of the shells, and strain the liquid into a pan. 

Carefully remove the beard. 

To prepare a tasty dish of mussels, melt 1 oz. of butter, and add 1 level tblsp of flour 
and cook, stirring for 2 minutes. 

Then pour in the mussel liquid and stir until it boils.

Remove from fire and cool slightly, add the yolk of an egg, pepper and salt to taste, vinegar, chopped coriander leaves. 

Cook till the egg thickens, add the mussels and stir well. 

Serve with SIL chilli villi sauce.

Remarks : 

To test to see if the mussels are fit for eating, put a small onion into the mussels when boiling them. 

If bad, the onion will become quite black, but if good, it will retain its natural colour and will not taint the mussels in any way.