Thats periwinkle in its shell we add to preparing stews and soup to add up to the meat and fish you use cooking i dont have a picture right now but i will get one for u here it either cooked with the shell or removed from the shell. If you remove from the shell its eaten directly like that but if you add the one in the shell to your food you suck out the food from the shell. They are gotten from the edge of swamps you need to do lots of washing before cooking if youre adding the shells
I will get pictures for you later
Thanks for reading 😀