Put the beans in a sieve, rinse with cold water and drain. Peel onions and garlic and dice finely. Wash the thyme and dab dry.
Heat 1 tablespoon of oil in a large pot. Brown the onions and garlic in it. Pour in just under 1 l water. Add beans, stock and thyme stalks, bring to the boil. Cover and simmer for about 25 minutes until the beans are slightly overcooked.
For the vegetable croutons peel, wash and chop the potatoes. Heat 1-2 tablespoons of oil in a large frying pan. Fry the potatoes for about 10 minutes, turning them over, until golden brown.
Clean and wash the vegetables. Cut leek into fine rings and paprika into small pieces. Add to the potatoes and fry for about 5 minutes. Season with salt and pepper.
Remove the thyme from the soup. Use a hand blender to briefly blend the soup coarsely so that not all the beans are crushed. Season to taste with salt, pepper and lemon juice. Serve the soup and sprinkle with the croutons.
Possibly garnish with thyme.