Poke
Cubed raw fish (classically ahi tuna), tossed in a marinade — traditionally simple: sea salt, seaweed (limu), and crushed candlenut (ʻinamona). The now-globally-familiar "poke bowl," loaded with mayo-based sauces and toppings, is a modern, largely mainland-driven evolution; for something closer to the original, look for poke counters inside local grocery stores, particularly on the Big Island and Oʻahu, rather than fast-casual poke chains.
Kalua pig
Whole pig, traditionally wrapped in banana and ti leaves and slow-cooked for hours in an underground oven (imu) lined with hot volcanic stones — the centerpiece of a traditional luʻau. Smoky, tender, and typically shredded; a version made in a regular oven or smoker is a very common home-cooking and plate-lunch staple.
Loco moco
White rice, a hamburger patty, a fried egg, and brown gravy, invented in Hilo in the late 1940s as a fast, filling meal for teenagers after sports practice. Now found everywhere from diners to fine-dining reinterpretations.
Malasadas
Portuguese-origin fried dough, rolled in sugar, brought to the islands by Portuguese plantation laborers in the 19th century. Leonard's Bakery in Honolulu is the most famous single source, but good malasadas — sometimes filled with custard, haupia (coconut) or li hing mui — are found island-wide.
Shave ice
Finely shaved (not crushed) ice, soaked in flavored syrup rather than just coated, often served with a scoop of ice cream or sweet azuki beans at the bottom. Worth seeking out a genuinely local shop over a resort version — the difference in ice texture is real and noticeable.
Spam musubi
A block of grilled Spam atop a block of rice, wrapped with a strip of nori — Hawaiʻi has one of the highest per-capita Spam consumption rates in the US, a legacy of WWII-era food supply logistics. Sold everywhere from gas stations to high-end delis; genuinely one of the best quick, cheap local snacks.
Haupia
A simple coconut milk-based dessert, gelatin-like in texture, traditionally cut into squares — a luʻau dessert staple, and a common cake filling and flavoring across the islands.