- Combine the onions, vegetable stock, tomatoes, carrots, and celery in a large saucepan. Bring to a boil, cover and simmer for 10 minutes.
- Add the red and green peppers, squash, corn, garlic, Cajun spice, paprika, and red pepper flakes. Continue simmering, covered, for another 10 minutes. Add tofu, cover, and simmer 10 more minutes. Season to taste with pepper.