Heat the olive oil in a large pot over medium heat. Add the onion and bell pepper mixture and sauté until soft.
Add the garlic. Sauté for another 1-2 minutes until fragrant. 5. Add the crushed tomatoes, paprika, and cumin to the pot and simmer for 5-10 minutes.
Stir in the cooked rice and vegetable stock. Add the gandules.
Cook until hot. Remove from heat and stir in the cilantro. Season with salt and pepper.
Cover and let rest for 5-10 minutes before serving.