Wash, clean and dice the tomato. Wash the thyme, dab dry and finely chop the leaves of 2 stems. Peel and finely chop the onion. Heat 1 tablespoon of oil in a pan.
Sauté the onion for 1-2 minutes, then add the minced meat. Fry the minced meat for about 4 minutes until crumbly. Add tomato paste, diced tomatoes, chopped thyme and 100 ml broth and simmer for 5-6 minutes, season with salt, pepper and paprika powder.
Melt the fat in a saucepan, stir in the flour and sweat for about 1 minute. Add milk and 200 ml broth while stirring and simmer for about 1 minute. Stir in parmesan. Season with pepper. Put eggs in boiling water and cook for about 8 minutes.
Wash, clean and slice the zucchini. Heat 1 tablespoon of oil in a frying pan and fry the zucchini slices for 2-3 minutes until golden brown. Rinse the eggs under cold water and cut them into thin slices with the egg slicer.
Pour 1/3 of the sauce onto the bottom of an ovenproof dish (approx. 1 1/2 litres capacity). Place 2 lasagne sheets on top. First place slices of courgette, then slices of egg on top and spread 1/3 of the béchamel sauce on top.
Place 2 leaves on top, then add the chopped sauce. Cover with 2 lasagne sheets. Spread the rest of the béchamel sauce on top. Sprinkle with gouda. Bake the lasagne in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 30-45 minutes until golden brown.
Garnish lasagne with the remaining thyme.