Saute the onions over med-high in a deep stockpot, then add the rest of the ingredients. Cover slightly ajar and turn down to a bare simmer for 4-6 hours, until the beef is tender and shreddable. Keep an eye on the liquid level by checking back every hour or so, adding more beef broth as necessary.
Crockpot barbacoa
Saute the onions first on high heat, then add the rest of the ingredients and set to low heat for 4-6 hours, until the beef is tender and shreddable.
Warm the tortillas. You need warm tortillas for the best taco experience. Soft and pliable tacos are where it’s at. We like using a tortilla warmer but you can just wrap your tortillas up in slightly damp paper towels and pop them in the microwave for 30 seconds. You can also char them on the stove for some crispy edges or lightly frying them on a nonstick skillet.
Fill the tacos. Be generous and top up your tacos with beef and a little drizzle of the consomé that the beef cooked in.
Top it up. Finish off your tacos with some toppings. Classic is chopped cilantro and onions, but you can go with anything you like. We added some pickled onions and sliced jalapeños. Don’t forget the hot sauce!