Boil a pan of salted water and cook the pasta according to the directions on the package.
While the water is boiling and the pasta is cooking, beat the eggs with the Parmesan cheese and a little ground pepper in a bowl.
Heat some oil in a frying pan and cook the peeled garlic cloves until they brown.Add the tuna fillet broken into small pieces and cook for a couple of minutes. Remove the garlic cloves.
When the pasta is ready, reserve 1 cup of the cooking water and drain the pasta.
Add the drained pasta to the tuna, mix well and then lower the heat and add the egg mixture. Cook while continuously stirring for 2 minutes.
If the sauce is too dry, add a little at a time of the pasta cooking water and mix until you get a creamy consistency.
Serve immediately with freshly grated pepper, chopped parsley (optional), and more grated Parmesan.