An excellent seafood in Deauville, Normandy, one could enjoy in the fish restaurant "Le Garage". Here you will very friendly service and fresh seafood! Oysters, mussels (the specialty is "moules à la normande" with cider), other shells and plenty of fish...
The yummy Santorini-cuisine will surprise you with some very yummy seafood dishes. My favourite was the specialty of the restaurant "The Nets" at Perivolos beach: sepia with wheat cooked in its own ink.
Another very cozy place for great Greek/ Santorini food is the family-run restaurant "Thalami" in Oia, north of Santorini. The name means the "hole where the octopus lives". Next to the small fried fish dont miss the mussels-plate...
