Have you ever eaten or cooked whelks (sea snails)? I received this excellent Portuguese cookbook (generally I don't like cook books) as a gift and it has a few whelk recipes I might give a whirl.
All you need to know about Portugal: The Cookbook | food | Agenda | Phaidon
It’s the largest collection of traditional Portuguese recipes ever translated into English, and it’s a deeply satisfying kitchen companion
www.phaidon.com