Finely dice the onion and chop the parsley. Add to a mixing bowl. Halve the avocados and remove the pits, then scoop out the flesh with a spoon and add to the bowl.
½ small red onion, Handful fresh parsley, 3 large avocados
Add the lemon juice, salt, pepper, and hot pepper flakes (if using). Use a fork to roughly mash the avocados and mix the guacamole until it reaches your desired texture.
Juice of half a lemon, ¼ teaspoon sea salt, ¼ teaspoon black pepper, ¼ teaspoon hot pepper flakes
Taste and adjust seasoning as needed. If you have time, let the guacamole rest, covered, for half an hour at room temperature before serving. This isn't mandatory but improves the flavour.
Notes
If your avocados are quite small, use up to five.To store guacamole, keep it in a sealed container in the refrigerator for a day or two. It will start to brown after a while - to help prevent this, cover the top in a thin layer of lemon juice and pour it off before serving.