Carne Asada Burritos

I lived in San Diego for 15 years and there were Mexican Stands with names like Roberto's,Alberto's,Hilberto's etc. They all served a large Burrito called a Carne Asada it has what i believe is skirt steak marinated in lime juice and other stuff then cooked and put into a large tortilla with onions,salsa fresca and alot of cilantro. And of course ripe avocado. I have been able to make a close version however it is not exact. If anyone knows how to make one just like the ones in San Diego I am sure alot of us would be in your debt. For those of you whom have never tried one next time you get to San Diego it is a must try. Thanks Russ