This Japanese cabbage salad is inspired by a Japanese BBQ restaurant I went to recently. Their salad dressing had a thousand island/ketchup taste to it which I really liked. So I'm replicating that today!
Use a mandolin or sharp knife to cut the cabbage into very thin slices. On my mandolin, I set it to the lowest setting of 1/32 inch.
Crush the sesame seeds into a fine powder in a mortar and pestle. You could also use a spice grinder.
In a small bowl, combine the mayonnaise, toasted sesame oil, ketchup, rice vinegar, salt, sugar, and crushed sesame seeds.
Start by mixing half the sauce with the cabbage. Taste it and if you like it saucier then add the rest. My wife is pretty picky so I usually just add half the sauce and then add more to my own portions.