Cut off the stalks of the zucchinis at the front and back and put them in a sieve. Place the sieve in a pot filled with water, put the lid on, and steam the zucchinis for 25 minutes until tender. Let the zucchinis cool down afterwards.
Mix all the ingredients for the ground beef filling and spread the mixture on the bottom of a greased springform pan. Cook the ground beef in a preheated oven set to 400°F for 15 minutes.
Boil the potatoes in salted water. Drain the potatoes, mash them, mix in the egg yolks, corn starch, and bread crumbs, and season with salt and pepper.
Spread the mashed potatoes over the cooked ground beef mixture in the springform pan.
Cut about a ½-inch thick strip from the zucchinis, hollow them out, and fill them with shredded mozzarella before wrapping each zucchini in bacon.
Place the zucchinis in a circle on top of the mashed potatoes before putting the springform pan back in the oven for 40 minutes at 325°F.
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