Peel and chop the onions. Peel and wash potatoes, carrots and celery. Dice everything roughly. Fry onions and vegetables in hot oil. Sprinkle with curry and sauté briefly. Season. Deglaze with 2 1⁄2 l water, add broth, bring to the boil, cover and cook for about 30 minutes.
Add cream, bring to the boil and puree the soup. Season to taste.
For the croutons, peel the garlic and chop very finely. Dice bread finely and fry in hot butter. Fry the garlic briefly. Season with salt. Fry bacon until crispy. Arrange soup e.g. in glasses.
Add croutons and crumbled bacon.