Last year my sister in law was visiting and before she prepared a clam recipe and a mussel recipe, she "fed" the mussels & clams some cornmeal (i think this is what she used) to clean out their systems before we ate them. I think she filled a bowl with water and cornmeal and let them sit in the fridge overnight. I may not have this exactly right, but that's was seems to stick in my memory.
Now my questions are:
1--is this necessary? None of my cookbooks recommend doing this. Is it some "industry" secret that I'm missing out on?
2--what exactly do I have to do in order to "feed" them? Anyone have any guidelines?
I searched through my cookbooks and I can't find anything detailing this procedure.