For the avocado mash: slice the avocado vertically around the pit, and separate the two halves. You can store and save the half with the pit in the fridge. Using a spoon, scoop out the avocado flesh, and discard the skin. Sprinkle with a pinch of salt, pepper, and red pepper flakes. Add the juice of half a lemon, and mash with a fork.
Spread the avocado mash evenly over the slices of toasted bread, and top with a few slices of pickled onions.
Recipe by Ally's Cooking at https://allyscooking.com/2016/08/28/avocado-toast-easy-pickled-onions/