This is a simple variation of the Sunday tomato sauce made by my great-grandmother, who would never waste a day at the beach without collecting at least a few mollusks. Although periwinkles were one of her favorites, she also included little necks, razor clams, and mussels in her sauce–essentially any mollusk she could find along the shore. She prepared her meals in a cabán, a screened-in summer kitchen in her yard, surrounded by children and grandchildren. It wouldn’t hurt to have a few assistants of your own to help remove the snails from their shells.
Serves 4 to 6