Ive been to Castaways many times prior to being diagnosed. I was a little worried coming back if there would be options for me. I asked them about the spam musubi and if the sauce was gluten free. They informed me that all of their sauces are gluten free but the musubi is cooked in a shared fryer. I asked if I could have it just not cooked and just have the sauce on top and they said they could definitely do that. When they brought out the food, they informed me that they did cook the spam to make it crispy but that they had done it in a separate and clean pan so that there wouldn’t be any cross contamination. Love that! Most of their menu seems to be gluten free, it’s not directly labeled though, so you will have to ask.
Had the Poke bowl here and was super good. Chef said all poke sauce was gluten free, they use gf soy sauce as the base.