Adapted from a recipe by Kikuchan at allrecipes.com. I'm told this is the commonest way to make this, even in Hawaii. Do try to get the Hawaiian salt; it adds a subtle flavor that will be missing with plain sea salt. You can often find it at high-end specialty stores like Trader Joe's, Whole Foods or Williams-Sonoma. Be sure to get a roast which has not been "injected with a salt solution" - it will make your dish terribly salty. If you use a smaller piece of meat, be sure to scale down the salt, the liquid smoke, and the cooking time!