2) Salt and pepper both sides, dip in the flour, then in the egg/milk mixture, then in the flour again.
3) In a deep frying pan or saucepan, heat about 5cm of oil over a medium heat. Fry the courgette slices until lightly browned on both sides.
4) Drain well on paper towels. Spread the toast with mayonnaise and make sandwiches with the courgette, onions and ham.