Wash and clean the tomatoes and cut them into small cubes. Celery clean, wash, cut into long, narrow sticks. Peel garlic, press through a garlic press. Spread the prepared ingredients in a frying tube.
Season with salt and pepper. Wash the fillets and dab dry. Wash and chop the herbs. Mix with mustard and breadcrumbs and spread on the fillets. Place on the vegetable bed and season with salt, pepper and lemon juice.
Close the tube and cook in the preheated oven (electric cooker: 200 °C/ circulating air: 175 °C/ gas: level 3) for 20 minutes. Then open the tube and cook for another 5 minutes. Serve in portions garnished with lemon and fresh herbs.
Fresh farmhouse bread tastes good with it.