Heat oven 200c/180c fan/gas 6. Pour the beaten egg into a shallow dish. Tip the Breadcrumbs onto a plate. Mix the lemon zest into the breadcrumbs along with the oregano and some salt and pepper.
Brush a nonstick baking sheet with the half the oil.Dip the fish strips into the egg, then roll them in the breadcrumbs. Transfer to the baking sheet
and bake for 20 mins until golden.
Meanwhile,mix the mayo with a Squeeze of lemon juice. Toss the spinach leaves and peas with a squeeze more lemon juice and the remaining oil, Serve the fish fingers with the spinach and peas and a spoonful of the lemony mayo.