Peel, wash and roughly dice the potatoes. Peel onions and garlic, dice finely. Clean, wash and chop the vegetables. Wash and chop the oregano, except for something to garnish
Heat 2 tablespoons of oil in a large pot. Fry the potatoes for about 5 minutes, turning them over. Fry onions and garlic briefly. Season with salt and pepper and take out. Heat 2 tbsp. oil in the frying fat. Sauté the aubergines and courgettes briefly while turning.
Add celery, tomatoes, potatoes, onions and garlic. Season with salt, chilli and oregano. Deglaze with 1/4-3/8 l water, stir in broth. Bring to the boil, cover and cook for about 30 minutes. Add olives, season again. Garnish with rest of oregano