1- Soak brain in salt water for 1 hour. Remove inner membrane.
2- Boil the water with salt and vinegar. Add brain to boiling water and cook for about 15-20 minutes. Remove from heat and place in a bowl of cold water until it cools.
3- Remove and dry with paper towel. Cut brain in two. Slice brain halves into 1cm pieces.
4- In a separate bowl, whisk eggs with a teaspoon of the flour.
5- Place brain pieces in remaining flour and then dip in egg mixture. Fry in hot oil until golden brown. Place on paper towel to absorb excess oil. Sprinkle black pepper over pieces and serve hot.