Mix 1 tablespoon Tomato Paste, 1/4 cup Water, and 1 tablespoon Lime Juice together and pour it into a slow cooker.
Using the back of a spoon or your hands, rub 1 tablespoon Taco Seasoning into a 2 pounds Tri-tip roast and place it into the slow cooker.
Turn the heat to low, and cook for 5 to 6 hours. Once the meat is cooked, use two forks to shred the meat and serve in warm tortillas with your favorite taco toppings.
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Notes
Calorie count is for the meat filling and not the tortillas. Store leftover taco beef in an airtight container once it cools to room temperature. Refrigerate it for up to 4 days or freeze it for up to 3 months. To thaw, leave it in the refrigerator overnight.Reheat the meat on the stovetop over low heat or in a 350°F oven until warmed through.