Dice tri tip into bite sized pieces, or shred. If shredding, you can shred more as it heats, just get it sliced enough that you can stir it with a fork.
Add all ingredients to a small saucepan and heat over medium-high heat until the water simmers, then reduce to medium or low. Heat for 10-15 minutes total, stirring occasionally.
Serve warm in your taco shell of choice with your favorite toppings.
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Notes
For diced tri tip, stir with a spatula. For shredded tri tip, stir with a fork (and use a stainless pot or pan, forks will scrape nonstick).
Nutrition information is provided as a courtesy and is an estimate. It is recommended to use your preferred calculator with the actual ingredients you use for optimal accuracy.