Wash and clean the spinach. Bring salted water to the boil and blanch the spinach in it in portions. Drain and squeeze the water well. Roughly chop the spinach. Melt the fat in a pot. Add flour and sweat briefly. Add milk and stock while stirring constantly and bring to the boil. Season with salt, pepper and nutmeg and put aside.
Wash the herbs, dab dry and pluck the leaves from the stems, except for some for garnishing. Roughly chop the herbs. Peel onions and garlic. Cut onions into fine rings. Press garlic through a garlic press. Heat oil in a pan. Fry bacon in it until crispy. Take out and drain on kitchen paper. Sauté onions and garlic in the frying fat until transparent. Add spinach and fry for about 3 minutes. Season with salt and pepper. Add herbs and fold in. Drain the mozzarella. Grate both cheeses. Brush a baking tray with oil.
Take out and drain on kitchen paper. Sauté onions and garlic in the frying fat until transparent. Add spinach and fry for about 3 minutes. Season with salt and pepper. Add herbs and fold in. Drain the mozzarella. Grate both cheeses. Brush a baking tray with oil. Place 4 lasagne sheets on top with a gap between them. Cover each with spinach and bacon. Add half of the sauce. Layer the remaining ingredients and sauce as described. Finish with lasagne sheets and sprinkle with cheese. Bake in the preheated oven (electric range: 200 °C/ convection oven: 175 °C/ gas: level 3) for 40-50 minutes until golden brown. Garnish with remaining herbs
Place 4 lasagne sheets on top with a gap between them. Cover each with spinach and bacon. Add half of the sauce. Layer the remaining ingredients and sauce as described. Finish with lasagne sheets and sprinkle with cheese. Bake in the preheated oven (electric range: 200 °C/ convection oven: 175 °C/ gas: level 3) for 40-50 minutes until golden brown. Garnish with remaining herbs