Rinse the tripe thoroughly under cold water. Blanch in boiling water for 10 minutes, then drain and set aside.
Heat the vegetable oil in a large pot over medium heat. Add the tripe and brown slightly, stirring occasionally.
Add the chopped onion and minced garlic to the pot. Sauté until the onions are soft and translucent.
Stir in the bell pepper, tomatoes, carrots, and potatoes. Cook for a few minutes until the vegetables start to soften.
Pour in the beef or vegetable stock. Add paprika, cumin, thyme, rosemary, and bay leaf. Season with salt and pepper.
Stir everything to combine. Reduce heat to low, cover, and let simmer for 1.5 to 2 hours, or until the tripe and vegetables are tender. Stir occasionally and adjust seasoning if necessary.
Remove the bay leaf. Garnish with fresh parsley or cilantro before serving.
Enjoy your meal!