Knead minced meat, mustard and breadcrumbs. Season with salt and chili. Shape into a flat meatball and fry in hot oil for about 6 minutes, turning. Halve the bagel. Sprinkle the lid with cheese and melt in a preheated oven (electric cooker: 225 °C/ convection oven: 200 °C/ gas: level 4).
Cover the lower half of the bagel with salad leaves and meatball. Drain the corn with kidney beans. Spread sour cream and drained vegetables on top. Put the lid on, sprinkle with fried onions and serve garnished with parsley.