Add warm water to a heavy-duty pot or heat-safe container, attach your immersion cooker heat water to 56C/133F. Cover to contain heat and prevent evaporation.
Clean and pat the meat dry. Add all the ingredients, except the sat and pepper, to a small bowl and whisk until well combined. Brush marinade onto both sides of the steak and sprinkle with salt and pepper. Add to a resealable sous vide bag along with remaining marinade. Pass the filled bag along the edge of a counter to remove excess air, or use the displacement method. Add the sealed bag to the heated water and cook for 2 hours.
Remove from the bag when cooked. Place on a cooling rack to allow the juice to drip off and pat (not rub) lightly with a paper towel. To finish the steak, heat a skillet or grill until smoking. Sear steak for about a minute, flipping every 10-15 seconds. Or, if you own a Searzall torch, that will do the trick! Cut into thin slices.
Make the tacos:
Build your tacos with all the fixings listed here, or any of your preference. Enjoy!