Tried this. Love it. I want to know the provenance of this recipe.

Tried this twice. The first time, I accidentally forgot the grapefruit juice. Apparently, lime juice + cinnamon + passion fruit + simple syrup combine to make grapefruit flavor, because with the grapefruit juice missing, I couldn't tell. When I added the grapefruit juice the second time around, it tasted exactly the same, just milder. YMMV.

So I tried this. When I googled "Yukari rice seasoning", every result pointed me to "Furikake". Yukari is the brand. My furikake seems based on shredded sushi nori and other "fishy/salty/umami" flavored bits which I put in the coffee grinder to make a powder. Then I made the cocktail per the instructions.

My only recommendation is to not let the lemon juice or the grenadine get control of the flavor. Don't be afraid to dump more of the rice seasoning in than you are comfortable with.