Onions peel and roughly chop. Clean, wash and cut the leek into rings. Pour kidney beans into a sieve and rinse with water
Heat the oil in a saucepan and fry the bacon slices for about 4 minutes while turning them until crispy. Take out, fry onion and leek for about 5 minutes. After about 3 minutes stir in tomato paste. Deglaze with stock, bring to the boil and simmer for about 10 minutes
Add white beans, kidney beans and sausage. Bring to the boil and simmer at reduced heat for about 5 minutes. Season to taste with Tabasco, salt and cayenne pepper. Coarsely crumble the bacon and sprinkle over the soup