Sprinkle the feta cheese slices with flour. Dip each slice, into the egg and then coat with crushed cornflakes.
Heat the olive oil in a frying pan. Fry the cornflake-crusted feta cheese slices for about 2 minutes on each side.
Place the slices on a serving dish. Drizzle with sour cherry juice, sprinkle with chopped pistachios, and season with fresh ground black pepper.