Combine all marinade ingredients in a blender, except the beer and puree into a think paste. Season the flank with kosher salt. Pour the ancho marinade onto the flank steaks and massage into the meat. Move the meat to a bowl and cover with the Pabst Blue Ribbon beer. Marinade for 1 to 2 hours.
Heat a grill for medium-high direct heat. Grill the steak over direct heat for 3 to 5 minutes per side or until it reaches about 127 degrees F. Set aside to rest for 5 minutes.
Meanwhile toast the tortillas and get your taco fixings ready.
Slice the flank into thin pieces across the grain and then again into bite sized pieces. Build the tacos by laying down some beef, diced onions, cilantro, a big squeeze of lime, and your favorite hot sauce.
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