Know your fishmonger ... I thought I did. Friday night was a hellish experience after cooking these little beauties ... I was so excited. Washed them well, debearded them, rapped each to check for them for vitality. Steamed them in a lovely dry cider and cream sauce ... knoshed them. And in the middle of the night ... felt like Hell.
Know your fishmonger. It will take a while before I brave mussels again, but I will cook them again.