Wonder if you could boil/steam them in white wine and garlic like mussels, oh now im hungry!
Here in Italy after the purge the snails are cooked in many ways, usually fried with lard (or buter) carrot, garlic, parsley, onion and some rosemary, sage and laurel. Then add some white wine, let evaporate and add some broth, if needed, until ready.
When ready add salt, pepper, some good olive oil and enjoy with some toasted slices of bread...
Anyway if I can remember in France the snails are sometimes cooked in Court Bouillon, 1/2 liter of white wine in 1 liter of water in which you should add parsley, thyme, laurel, onion, shallot, garlic, salt and pepper, clove, and other spices according to taste.
If someone doesn't like the slimy they can be rubbed when taken out of the shell with raw yellow maize flour..