The main difference (aka advantage) of dishes in this region is their seasonality, which always attracts avid gourmets. Almost all the products that form the basis of Corsica's cuisine are grown, cultivated and fished here.
The proximity of the sea allows local restaurants to pamper their guests with exquisite, and most importantly - fresh seafood dishes, and the warm climate allows them to grow fresh vegetables on their own territory.
Another pride of the local cuisine is the diverse and incredibly tasty cheeses. The cheeses are what you should definitely try in Porto Vecchio.
You should also try the famous Corsican sausages, stuffed eggplant and gnocchi with mussels. All this is perfectly complemented with a glass of excellent wine from local grapes. Many local restaurants have their own sommelier who will be happy to advise you on the subject.