Cut the fish fillets into strips roughly 2 cm wide.
Set up three bowls: one with flour, one with beaten eggs, and one with breadcrumbs mixed with lemon zest, salt, and pepper.
Dip each fish strip first into the flour, then into the eggs, and lastly coat with the breadcrumb mixture, making sure each piece is well covered.
Heat the vegetable oil in a frying pan over medium heat.
Fry the fish fingers in batches for about 2-3 minutes on each side or until golden brown and crispy.
Remove the fish fingers and let them drain on a paper towel to remove excess oil.