Chop the spring onions in small slices. Slice the zucchini in thick long slices, 1/4 inch (4 mm). Peel and slice the potatoes in thick slices too, 1/4 inch (4 mm).

In a medium size frying pan add two tablespoons of Olive Oil. Turn the heat on at high and add the spring onions. Stir and cook for 2/3 minutes. Add the zucchini slices and adjust with a pinch of salt. Cook at low/medium heat for 6 to 8 minutes. Stir occasionally.

Meanwhile blanch the potato slices in boiling water for 3 minutes. Drain and let it cool down.

Grease a rectangular shape baking pan with few tablespoons of Olive Oil. Sprinkle with the breadcrumbs.

Layer all the ingredients starting with the potato slices. Add the speck ham. Spread few tablespoons of ricotta cheese, fontina cheese in slices. One layer of zucchini. Start again with another sequence of potatoes, Speck ham, ricotta cheese, fontina cheese, zucchini.

The last top layer will be potatoes, fontina cheese and grated Parmesan cheese.

Cover the baking pan with an aluminum foil.

Bake in the oven (already preheated) at 400F/180C for 35 minutes.

Remove the aluminum foil and keep baking for and additional 30 minutes.