2Carefully open each Mussel with a small, sharp knife, detaching the mollusk from one half of the shell. Discard one half of the shell, leaving the mollusk attached to the other half.
3For the stuffing, finely chop 2 cloves of Garlic and half of the Fresh parsley. In a bowl, combine the Dry breadcrumbs, grated Parmigiano-Reggiano, grated Pecorino Romano, chopped Garlic, and chopped Fresh parsley. Add the Eggs, a pinch of Salt, and a pinch of Black pepper. Mix well until a cohesive, moist stuffing is formed.