The correct name of this frosting as it has been known in my family for at least 4 generations is panocha frosting. Panocha is a spelling variant of penuche that was once popular in Hawaii, and was localized from penuche to panocha. Panocha is also a type of cane sugar and a type of fudge-like candy.
I think of this as my grandmother's recipe, but it's actually her mother's or her mother-in-law's...either way, it was a special cake that she would make for my father's birthday, as it's his favorite cake (and mine too). It's a simple seeming cake (no vanilla?! not a spice to be found?!), but it's like your favorite banana bread, only lighter and fluffier, and the frosting truly makes this cake.
If you're into presentation, you'll want to follow my grandmother's lead and double this recipe, a four-layer cake is much more impressive. I never add the nuts, and I've had no problem substituting all-purpose flour. I've even been lazy and not separated the eggs, and it has turned out just fine, albeit with a bit denser crumb. —Lindsay-Jean Hard
Test Kitchen Notes
WHO: Lindsay-Jean Hard is a contributing writer and editor at Food52!
WHAT: The lightest, purest banana cake you'll ever meet, dressed up in a caramelly frosting.
HOW: Make a simple cake -- mix your wet ingredients and dry ingredients, bake in two layers -- then frost.
WHY WE LOVE IT: We've had great banana breads before -- but never banana cake. This has a light, airy crumb, one that lends itself well to a layer cake. But the real star here is the frosting; its brown sugar-milkiness shines through, a perfect complement to the banana. We're now adopting this into our own family canon, too. —The Editors