Very simple. Just mix.
I added Krazy Salt to avocados, which I love and it was delicious. If you cut the avocado and find it to be black... just make guacamole out of it.
After soaking the onion, be sure to get rid of any moisture. For the avocados, cut in half, remove the seed and peel, and crush by hand to make the paste. I recommend using a lot of Krazy Salt.
Enjoy Japanese food around the world.