Clean the clams. Begin by mixing the salt and cold water together in a large bowl.
Place the clams in the water to soak for 20 minutes.
Remove the clams and use a bristle brush on the shells, getting off any dirt.
Rinse the clams in cold water and set aside.
Using a large iron skillet (with a lid), melt half of the butter over medium heat.
Add the garlic (and if you want, some shallots), stirring for 30 seconds.
Pour in the wine and lemon juice.
Bring the mixture to a low-rolling boil.
Put the clams in with the other half of the butter.
Cover to steam for 8 minutes.
Remove the clams, discarding any that are still closed.
Sprinkle parsley over the top of the clams.
Set them on a platter of linguini With some pan drippings and lemon wedges. Have a baguette for dipping.