I don't have a specific recipe because I'm not good about measuring (which is why I don't bake) - but since everyone has been asking me - this is how I make it.
I just slice up maybe one or two tomatos and maybe a half or less of an onion. Add several dashes of cilantro and salt. (just taste). If you like it hot - cut up a jalepeno - I prefer no!
Use one or two avacoados (usually one per person) and smash it up and mix all ingredients together. I usually squeeze 2 limes on this because I like mine with a lot of lime taste! Just add more or less of the ingredients you like.