Boil water and cook the eggs for 6-7 minutes. Peel the eggs, and then smash them with a fork.
While the eggs are still hot, add butter, grated cheese, black pepper, and garlic. Mix and smash everything well.
Add the cod liver and a little bit of its oil to the bowl. Smash and mix everything together. Let the salad cool in the refrigerator for at least 30 minutes. Serve and enjoy this delicious canned cod liver salad!