Soak the clams in a large bowl of cold salted water for a couple of hours to get rid of any sand. Give them a good swishing around in the soaking water a few times and change the water if there is any sand. Discard any clams that are well opened.
In a large frying pan that will hold all your pasta later, heat the garlic in the olive oil until it smells good. Add the drained clams, parsl