Grind Musubi is a Hawaiian belly bomb in the best way. At the diminutive SE Division Street take-out shop, fist-size mounds of sushi-grade rice come stuffed with fillings like chicken curry or sour plum. Half the fun is unwrapping the package, which contains a seaweed shell folded around the rice ball. Favorites so far? A Kewpie mayo-slicked spicy tuna and a rice log topped with “artisan spam”: pork shoulder, uncured ham, salt, and garlic, glazed with teriyaki sauce and grilled. P.S.: A portion of every sale goes to fighting hunger.