I used to get both limu and inamona (ground kukui nut) from Takahashi Market in San Mateo. My “recipe” was the best ahi I could buy marinated in sesame oil, chili pepper flakes and soy sauce; tossed with chopped Maui onion, red Hawaiian sea salt, limu and inamona.
Any sweet onion will do in a pinch. Toasted, chopped macadamia nut and some sesame seed is a decent substitute for real inamona. But I haven’t found a replacement for limu.
Inamona doesn’t last forever and limu is very perishable. But I crave poke so much I’m tempted to mail order the real stuff stuff since I moved away from the Bay Area.