Rinse the beans in a sieve with cold water and let them drip off. Wash parsley and shake dry. Chop leaves. Peel 1 onion and 1 garlic clove and chop finely. Mix with beans, parsley, flour, sambal oelek and mustard.
Knead into a mass with your hands. Season with salt and pepper. Leave to soak for about 1 hour.
Preheat oven (electric cooker: 225 °C/circulating air: 200 °C/gas: see manufacturer). Peel and wash sweet potatoes and cut them into approx. 1 cm thick sticks. Mix with 2 tablespoons of oil and sea salt. Distribute on a baking tray.
Roast in a hot oven for about 20 minutes, turning carefully with a pallet.
Peel the rest of the garlic and chop finely. Mix with salad cream and yoghurt. Season to taste with salt and pepper. Peel remaining onion and cut into thin rings. Clean, wash and spin dry the salad.
Drain the peppers. Cut avocado in half, remove core. Remove the flesh from the skin. Cut into slices.
Form approx. 4 burgers in roll size from the bean mixture. Heat 2 tablespoons of oil in a frying pan. Fry the burgers for about 3 minutes on each side.
Cut the rolls in half and toast them. Cover lower halves with salad cream, lettuce, paprika, burger, avocado and onion. Place upper halves on top. Add sweet potato chips.