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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.
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Add the tomato paste and cook, stirring, for 1 minute.
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Add the beef stock and bring to a simmer. Simmer for 20 minutes.
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Add the tri tip and simmer for about 10 minutes.
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Add the cilantro and lime juice, and stir well. Remove from the heat and cover to keep warm. Serves 4-6.