Begin by slicing the onion.
In a large saucepan, sauté it with olive oil.
Add carrot, celery, and garlic, then mix and cook on low heat.
Prepare the cabbage: wash, remove the core and slice.
Wash black cabbage, remove tough parts, and chop.
Combine savoy cabbage, and cabbage, and season with salt.
Let it cook for 5 minutes. Add chili.
Pour 1.5 litres of vegetable broth, cover partially, and cook for 30 minutes.
Slice the bread, toast it, and drizzle with oil.
Place 2 bread slices in each bowl, pour soup and serve.