It's downright embarrassing no one has mentioned this yet:
I took a sushi class last year. The chef told us that this(mixed with mayo) is what is on the above-mentioned Bam Bam Shrimp.
Was is "Gohan"? If so
No clue what Gohan is.
Took the class through JoCo Culinary Academy
It was awesome and now I can make kick ass rolls at home.