Cut tempeh into small cubes. Add to a frying pan with enough water to mostly cover the tempeh.
Bring to a boil and then simmer for 5-7 minutes, or until tempeh is soft enough to break up.
Drain water, add diced onion and 2 tsp oil of choice. Set to medium heat and use a cooking spatula to break up the tempeh so it begins to look like ground meat. After ~2 minutes, add in taco seasoning. Cook for another 3-4 minutes.
Serve with romaine, black beans, cherry tomatoes, mango, and avocado lime dressing