In a frying pan, heat 2 tablespoons olive oil, and then add the onions and garlic. Let it cook for 2 to 3 minutes. Set aside.
In a container, mix the ripe mashed plantain with cod, cilantro, cake flour, and add the sautéed onion and garlic.
Take the mixture by tablespoons and form little balls. Then coat the balls in the wheat flour, then with the beaten egg, and finally in Panko.
In a deep skillet, pour 4 cups of corn oil and let it heat. Put the little balls into the oil in small portions and fry them until golden brown. Serve with your favorite sauce.