Cut the mettenden into slices. Peel and slice the carrots. Clean, wash and cut leek into rings. Peel and roughly chop the onions. Peel and wash potatoes and cut into cubes
Heat the oil. Fry the mead and onions for about 5 minutes. Add the rest of the vegetables, wine and 3/4 litres of water, bring to the boil and simmer for about 20 minutes. Season with broth. Pour beans into a sieve and rinse with cold water. Add tomatoes and beans to the soup. Chop the tomatoes, bring to the boil and simmer for another 10 minutes
Wash oregano, shake dry, pluck leaves from the stalks and chop. Season soup with salt, pepper and oregano and serve