35 years ago when I was getting my undergrad bartended at a Mexican restaurant, I used to help in the kitchen as well when I got there early and bar prepped. They would always have me make the guac. 5 gallon plastic bucket, fill with avocados, fresh squeezed lemons, and salt. They had all the measurements can't remember, x cups of salt, x lemons. That is all that went in it, and customers used rave how good it was, I would tell them it is so simple you will not believe it. I think we used lemons because they had more juice, but it is great.
To me when it is made this simple, it tastes the freshed. Just try it.