Pour the flour, and the bread crumbles in one bowl each.
Whip the eggs lightly in a bowl.
Squeeze the citron juice on the fish fillets, and sprinkle them with the spices.
Roll the fillets in the flour, then the eggs and finally the bread crumbles. Make sure to cover the fillets with each ingredient.
Heat up a frying pan and add the butter and the oil and fry the fish until the surface is crispy.