Prepare Swordfish: Remove the skin from the swordfish, trying to avoid waste. Cut the swordfish into fairly small cubes and place them in a bowl.
Soften Bread: In another bowl, soak the sandwich bread slices in milk just until softened. Squeeze out the excess milk and crumble the bread into the bowl with the swordfish.
Mix Ingredients: Add crushed garlic (optional to remove the central core if desired), chopped parsley, lemon zest, pepper, salt, one egg, and 30 g of grated breadcrumbs to the swordfish and bread mixture. Knead with your hands and check the consistency. Add more breadcrumbs if necessary to make the dough firm.
Form Meatballs: Shape the mixture into meatballs of equal size, slightly oval. Dip each meatball first in beaten egg, then coat well with breadcrumbs.
Cook Meatballs: Fry the meatballs in very hot peanut oil, three or four at a time, until golden brown and crispy. Alternatively, bake them on a baking tray sprinkled with extra virgin olive oil at 180°C (356°F) for 20-25 minutes until super crunchy.
Serve: Plate the meatballs and serve hot.