Sauces can be complicated, too. The following can contain wheat, hence, not gluten-free: soy sauce teriyaki sauce, eel sauce, barbeque sauce, ponzu sauce, and spicy sauces that may contain mayo. You might just want to bring your own gluten-free sauce for your sushi.

What sushi sauces are gluten-free?

Alternatives to soy sauce include gluten-free tamari or coconut aminos. Watch out for sushi rolls that include soy sauce in their preparation, have marinated eels (unagi) or other fishes, or that may include fried or breaded ingredients such as tempura style vegetables or fish.

Is eel in sushi gluten-free?

Marinated fish: The main culprit here is unagi, which is freshwater eel covered in a sweet glaze. The glaze, similar to a teriyaki sauce, often contains gluten. Although unagi is what you really need to watch out for, any fish that's listed as marinated or glazed needs further inspection.