Add all ingredients for the Carne Asada to a gallon sized zippered bag. Let marinate in the refrigerator at least 4 hours (up to 24hrs).
If you using the corn salsa recipe that I listed below, it would best to make it at the same time you put in the meat to marinate.
In a large saute pan over medium-high heat, add marinated meat. Cook for 5 minutes on each side. Remove from pan and let rest on cutting board for 5 minutes. Thinly slice and then cut into 1-inch pieces. Return to pan and cook until desired doneness.
In a separate pan over medium-high heat, lightly toast each tortilla - about 45 seconds on each side.
To build the tacos, start with a smear of sour cream then sprinkle with cheese. Add a portion of carne asada and then a spoonful of corn salsa.