Let the puff pastry thaw. Preheat the oven to 200 °.
Roll out the puff pastry 1/2 cm thick and line the bottom and sides of a springform pan with it.
Slice the onions, mash the garlic and dice the bacon.
Fry the onion slices in the oil, season with salt and pepper, add the garlic and the diced bacon and fry everything for five minutes. Knead with the breadcrumbs, minced meat and sausage mixture and spread on the dough. Spread the garlic sausage slices on top.
Whisk the eggs with a little cold water and the herbs, pour them over the cake and bake for 40 minutes on the second sliding bar from the bottom.