Well, I tried the method Dee posted about dropping an unpeeled avocado into a boiling pot of water for exactly ten seconds and moving it to a tub of ice water. I did that and served the avocado with a meal of leftovers.
I had four nice slices of ribeye steak leftover from dinner the other night. I chopped them up and added them to a pan of thinly sliced onions that I was sweating down.
Added some of my homemade taco seasoning (not too spicy, and not much salt). Plated with a couple of small soft taco shells, some shredded four cheese Mexican blend, some chunky salsa and the avocado, chunked up in the shell.
Came out really good, if I do say so myself. The avocado was very tasty with the rest of the meal.
The avocado after two hours still looked totally fresh. I will try this again. It may help make my guacamole look fresher longer, I hope.
Art