Heat the olive oil in a saucepan. Add onions and garlic and sauté gently. Now add the bacon and fry it. Next, add all the vegetables, season with salt and pepper and fry briefly. Now deglaze with the meat stock and pour in enough so that the vegetables are well covered. Cook everything for about 40 minutes over medium heat.
Season with lemon and sprinkle with finely chopped parsley or mint. Serve warm.