With a special knife, remove the zest from the orange with thin short chips. Drizzle with olive oil and lemon juice, season with a pinch of nutmeg, salt and freshly ground black pepper. Leave for 10-15 min.
Wash the potatoes with a brush, cut them into circles 3-4 mm thick, prepare the carrots in the same way. Pour boiling water over spinach and drain in a sieve. Mash the cheese with a fork.
Grease a small heat-resistant form with olive oil, sprinkle with a small amount of breadcrumbs.
Mix spinach with orange zest. Alternating layers, lay out half the spinach, carrots, spinach again and potatoes.
Beat cream and eggs with a mixer, pour over vegetables, sprinkle with cheese, cover with foil and bake at 180-200 ° C for 30 minutes.
Remove the foil and bake for another 10-15 minutes, until the potatoes are fully cooked. Serve the casserole warm