Anyone have a good Guacamole recipe without onions?

Ripe avocadoes, lime juice, salt, bit of pepper if you want, lots of chopped cilantro, chopped skinless tomatoes,bit of vinegar (Not much), mush and mix and serve cold, and if you don't want the avocadoes turning black (Which happens fast cover with saran wrap until dinner time but make sure the plastic actually "Touches" the guacamole, no air in between.