1. Heat a large skillet over medium heat. Add beef, crumble it, add onion and garlic. Cook until beef is no longer pink.
2. Add cauliflower and bell peppers, cook for 10 minutes, until vegetables are tender.
3. Add tomatoes, cumin, paprika, oregano and cayenne pepper. Season with salt to taste. Cook for another 5-7 minutes, stirring occasionally. Garnish with cilantro and serve.