I actually have to make some. It’s a rare thing, really. Not something you’re going to find at the grocery store. Could be totally a Hawai’i only thing. I’ve never seen it anywhere outside of Hawai’i… but it is a staple.
Recipe is here: http://www.hawaiianelectric.com/heco/_hidden_Hidden/Recipes/Butter-Mochi
It should look like this….
Now every family has their own little tweaks. I prefer actual grated coconut in mine and sometimes grated mac nuts. Some people like a drizzle of chocolate. Others, green tea. But regardless, it’s all good.
I really should make some.
Rhys Ford 
OMG!! That looks SOOOOOOOOO good!! What’s the consistency like? Is it like a Latin flan?
Um… it’s more like mochi 😀
Sounds pretty tasty since I gather it’s basically cake and I’m all about cake. Do you have to cut it for consistency or would it be OK to leave in a big cake and slice as necessary?
By consistency I meant the cake texture not exact sizing (though it is frequently brought up about the time I used a ruler to portion a cake five ways) 😉
It’s never lasted long enough to find out.
You start w uncooked rice, yes? And it soaks up the liquids and cooks as it bakes?
No, it uses rice flour. The link’s up there. Pretty easy to make.