Put onions, zucchini and carrots in a bowl. Add the minced meat, salt, pepper and the peas and mix everything well. Pour the entire dough into a prepared dish and press down a little all around.
Bake at 180 ° C for about 45 minutes, the oven is not preheated.
After about 20 minutes, spread the sliced green bell pepper, the tomato slices, a few more chopped onion remains and the cheese on top and finish baking.
For the tzatziki, put the Greek yogurt in a bowl. Grate the cucumber and onion, finely chop the garlic cloves and add everything to the yogurt. Season with salt and pepper and add a few more squirts of lemon juice. Then mix everything well and let it steep.