Hawaiian
The cuisine most prone to being flattened by outsiders, so handle it with care and precision. The single most important distinction: Native Hawaiian cuisine (Indigenous foodways) and Hawaiʻi local food (the multicultural plantation-era and post-plantation cuisine) are related but not the same thing. Lumping them together, or calling generic pineapple-on-everything "Hawaiian," misses the reality.
The two registers
Native Hawaiian / traditional. Built on the staples of the islands: kalo (taro), pounded into poi; ʻuala (sweet potato); ʻulu (breadfruit); fish and seafood; pork; and limu (seaweed). Traditional cooking uses the imu, an underground earth oven, which gives kālua pork its tender, smoky-earthy character through covered hot-rock roasting/steaming more than barbecue-style smoking. Salt (Hawaiian sea salt; ʻalaea with red clay), limu, and kukui nut (ʻinamona) season foods like older Hawaiian-style poke (raw fish with sea salt, seaweed, and kukui nut, not the sauced mainland build-a-bowl by default). Lūʻau leaves are taro greens and must be cooked thoroughly; raw or undercooked taro leaves irritate the mouth and throat.
Hawaiʻi local food. The plantation era brought Japanese, Chinese, Filipino, Portuguese, Korean, Puerto Rican, Okinawan, and other workers, and "local food" is the genuine fusion that resulted: a cuisine in its own right, not a gimmick. The plate lunch (two scoops rice, mac salad, a protein) is its emblem. Spam became entrenched during the WWII/military period; Spam musubi later married canned pork with Japanese rice-and-nori logic. Loco moco (rice, burger patty, egg, gravy), Portuguese malasadas and sausage, Japanese-derived teriyaki, Filipino adobo and pancit, Chinese char siu and manapua, saimin (a local noodle soup). Shoyu is everywhere; sweet-savory glazes are common.
Flavor logic
For traditional food: clean, ingredient-forward, the earth-oven smoke/steam of the imu, the minerality of sea salt and limu, and the starch of kalo/poi, ʻuala, and ʻulu. For local food: savory-sweet (shoyu, sugar, teriyaki and char siu influence), garlicky, rice-centered, generous and comforting, with each immigrant cuisine's logic still visible. Local food's fusion comes from colonial plantation labor systems and migration, not just a cheerful mixing bowl story.
Core techniques
Imu cooking for kālua (a Dutch oven, slow cooker, or slow braise with a little liquid smoke approximates the flavor, honestly labeled as an approximation). Marinating in shoyu-sugar-garlic-ginger glazes (teriyaki, local kalbi). Making poke by seasoning very fresh fish with salt, seaweed, sesame, onion, and/or shoyu depending on style, not drowning it in sauce. Assembling the plate lunch. Frying and griddling (Spam, eggs, burgers for loco moco). Working with taro/poi and lūʻau leaves requires respect for sourcing and safe cooking.
Pantry backbone
For local food: shoyu, sugar, garlic, ginger, sesame oil, rice, Spam, eggs, scallion, mayonnaise (for mac salad), gochujang/chile for Korean-influenced local dishes, furikake, and a sweet-savory glaze base. For traditional food: taro/poi, sweet potato, breadfruit, very fresh fish, Hawaiian sea salt, limu, kukui nut. Many traditional ingredients are hard to source off-island, and commercial "Hawaiian" salts are not all equivalent. Sometimes the respectful move is a good local-food dish rather than a pretend-traditional one.
Common outsider mistakes
The pineapple trap is the obvious one: pineapple is a plantation crop, not the soul of the cuisine, and "Hawaiian pizza" is Canadian. The subtler mistake is merging Native Hawaiian foodways and Hawaiʻi local food until both disappear. Poke is seasoned fish, not a sauce-drowned bowl by default. Kālua made without an imu can be a useful home approximation, but label it that way. And with local food, name the lineages -- Japanese, Filipino, Portuguese, Chinese, Korean, Puerto Rican, Okinawan -- because that's part of the cuisine's real history.