Wow, what a salad dressing!
A lady I know is a great cook, and she gave me this recipe:
1 part soy sauce (I use Kikkoman)
1 part oil (take a cheap one: it shouldn't give any taste to the dressing)
1 part honey (sugar works, too, but will take a while to dissolve in the soy sauce)
cayenne (or tabasco)
garlic (crushed cloves to taste, or use top-quality dried garlic instead)
More exact measurements, for the sugary dried spices version: about 1 dl oil, 1 dl soy sauce, 2 tablespoons sugar, 1 teaspoon dried cayenne, 1 teaspoon dried garlic. Add 3-4 tablespoons of this, well mixed, to your green salad of choice (or to your sashimi). Yum.
I've made a couple batches now, and the lettuce with tomatoes and feta just flies off the table. Like, wow.