Pre-heat the oven to 180°C / gas mark 4.
Toss the potato fries with olive oil and season well.
Bake for 25–35 minutes, until golden and crispy.
Meanwhile, assemble the pea salad: watercress, cooked peas, some chopped avocado and fresh mint.
Cut your preferred fish into batons, about an inch thick.
In a bowl, beat two eggs. In another bowl, mix flour with some salt and black pepper. Pour fresh breadcrumbs into a third bowl.
Toss the fish in the flour to coat, then dip the fish pieces into the egg and shake off the excess.
Roll the fish in breadcrumbs until well-coated and place on a baking tray.
Heat 1 tbsp of oil in a large non-stick frying pan over a medium heat and add the fish fingers.
Fry for 2–3 minutes on each side, until golden, crispy and cooked through.
Arrange the cooked potato on a plate, spoon on your pea salad, and arrange your fish fingers on top.