
In a large pot of boiling water, boil for approximately 20-30 minutes the sliced calamari until tender, remove to a separate medium-sized bowl with a slotted spoon.
Keeping the pot of boiling water add mussels and cook 3-6 minutes, remove to the same bowl with the calamari and add the shrimp to the boiling water and boil or 3-6 minutes, remove to the same bowl.
Drain the fish in the medium-sized bowl a second time just to remove excess liquid and let cool. Add the chopped celery, grated carrot, chopped olives, chopped parsley , olive oil and lemon juice. Gently mix to combine well.
Refrigerate for at least 2-3 hours to combine flavours.
Before serving add a little more olive oil (3-4 tablespoons) and salt if necessary, you could also add some extra chopped fresh parsley. Some people like a drizzle of Balsamic vinegar or extra lemon juice. Serve with crusty Italian bread. Enjoy!