Wash the squid and remove the heads with the tentacles. Set aside. Empty the squids of their entrails.
Chop the tentacles. Set aside.
Wash the salted capers to get rid of the excess salt. Chop them with the black olives.
Crumble the bread and combine it with warm water. Set aside.
In a saucepan, fry the chopped garlic and anchovies in olive oil. Sauté those for a minute and then add the chopped tentacles.
Add half of the white wine and let it soak in the mixture. Once the wine has evaporated, add the soaked breadcrumbs.
Add some of the chopped parsley, and mix well. Make sure to leave about a teaspoon of the parsley and set this aside. Once everything is well combined, transfer it to a bowl.
Add the egg and grated Parmesan cheese to the bowl and combine, until it becomes a homogeneous mixture.
Put the mixture in a pastry bag and carefully fill the hollowed squids. Close each squid with a toothpick.
In a saucepan, heat up some olive oil and add the sliced garlic. Cook the stuffed squids and garlic in medium heat until they become a bit brown. Turn the squid to cook both sides.
Carefully add the rest of the white wine to the saucepan. Add salt and pepper, to taste. Cover the saucepan and cook the squid for about 10 minutes.
Sprinkle more chopped celery, and then turn off the heat after about a minute. Serve immediately.