Combine the milk and red wine vinegar. Place your liver in a shallow plate and pour the milk mixture over it to cover completely. Place in the refrigerator for at least 1 hour, or overnight.
2 slices of calf or beef liver (about 0.2 kg or approximately 1/2 pound, 1 cup milk, 1 teaspoon red wine vinegar
In a bowl whisk together the flour, oregano, pepper and salt.
1 cup flour, 1 teaspoon dried Greek oregano, 1/2 teaspoon ground black pepper, 1/2 teaspoon salt
Remove the liver from the milk mixture and coat it thoroughly in the flour.
Pour the olive oil into a frying pan so that it is 1/4 inch deep. Heat over medium heat and add the liver slices to the hot oil. Fry for 2 - 3 minutes per side, depending upon the thickness of the liver
Remove from the pan and serve with fresh lemon wedges.
Enjoy!