Directions :
Mix together the cumin, salt, garlic powder, pepper, and coat the carne asada with it. Slice into strips, then dice. Add it to a large plastic bag or bowl with a cover, and mix the meat with the serrano pepper, tomato, onion, and beer. Allow to marinate for at least 15 minutes, but up to 1 hour.
Heat a large skillet with the canola oil over medium-high heat, then pour in the entire marinated mixture and allow to cook, stirring occasionally, until all the liquid has evaporated and the meat is cooked through around 20 minutes.
Serve in street taco corn tortillas and top with onion and cilantro.
For the Guacamole :
Lightly mash avocados with a fork, leaving chunks, if so desired.
Add diced onions, cilantro, jalapeno. Drizzle with fresh lime juice. Sprinkle on salt and garlic powder. Stir.
Taste and add more salt as needed. I tend to like my guacamole with some flavor so I add a little extra salt.
Enjoy !!