Borlotti beans and Kale soup

Sauté the chopped onion in a little oil in a casserole, add the black cabbage, washed and cut into strips and leave to simmer. Once the vegetable water has evaporated, add the Borlotti beans with their water (yes indeed: Valfrutta pulses do not contain preservatives and their covering liquid can be used for cooking), 1 litre of warm water and a stock cube. Leave to simmer for 15'. In the meantime, sprinkle the bread with the cheese and some pepper and grill. Serve the soup in dishes with the cheesy toast.