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Heat oven to 180C/160C fan/gas 4. Put the bread on a baking tray with the caraway seeds, half the oil and some sea salt, and bake for 10-15 mins or until golden and crisp. Set aside.
Meanwhile, heat the remaining oil in a large saucepan over a medium heat. Add the garlic, carrot and potato and cook for 5 mins, stirring frequently, until a little softened.
Add the stock, tomatoes, sugar, bouquet garni, celery and seasoning and bring to a rolling boil. Reduce the heat, simmer for 10 mins, then add the cauliflower and cabbage. Cook for 15 mins until the veg is tender.
Stir in the Worcestershire sauce and mushroom ketchup. Remove the bouquet garni and serve the soup in bowls with the caraway croutons.
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