In a Dutch oven or large heavy pot, heat the oil on medium-high heat. Add the onions, garlic, peppers, salt, cumin, and corianderfor 5 minutes.
Add the tomato paste and cook, stirring, for 1 minute.
Add the beef stock and bring to a simmer. Simmer for 20 minutes.
Add the tri tip and simmer for about 10 minutes.
Add the cilantro and lime juice, and stir well. Remove from the heat and cover to keep warm. Serves 4-6.