This is a good cooking liquid for clams:
1/3 c freshly made garlic-sage butter
1/2 lemon peel, no pith, thinly sliced
juice of half a lemon
1 tbsp Chinese cooking wine (or substitute with a dry sherry)
1/4 c water
You'll need a covered casserole pan for this. Since most of the cooking happens with the lid on. If the clams are fresh, like these were, all the clams should open within 2-3 minutes of cooking. Don't cook them for longer than 5 minutes, or the meat will be tough and chewy.
Cheers!