Combine crackers, parmesan, and parsley in a shallow bowl.
Combine flour and pepper in another bowl.
Place lemon juice and beaten egg in separate bowls.
Heat oil in 12" frying pan.
Dip fish in lemon juice, then flour, then egg, and finally the crackers. Place fish in a single layer into the frying pan and fry over low - medium heat for 5-7 minutes per side. Fish should flake when done.
Drain on paper towel and serve with lemon slices. Garnish with rosemary, parsley, and dill if desired.