Slice the zucchini and blanch for 5 minutes in boiling water, drain.
Mix bread crumbs, milk and lemon peel together, blend with zucchini.
Whip eggs, add water and spices, and whip again. Pour into hot omlette pan greased with butter/oil. When eggs begin to set, top with zucchini mixture. Sprinkle with cheese, place under a hot broiler until slightly browned.