Blend ingredients in the food processor one after another, stir and simmer. You can make it quickly.
I bought a food processor a few years ago just to make this sauce. Over time, I started making it without checking the recipe,and the portions grew to about twice the amount of this recipe.
Adding vegetables in this order makes the sauce tasty. When you use spaghetti, pour pasta water into the sauce pan and the sauce will coat the spaghetti well.
Enjoy Japanese food around the world.