The Sushi Situation: More Complex Than It Looks
Sushi seems like a naturally gluten-free food: fish, rice, seaweed. In reality, a typical sushi meal involves multiple gluten-containing ingredients hidden in sauces, fillings, and condiments. Knowing exactly what to watch for allows you to enjoy sushi safely.
The core issue is soy sauce. Nearly every sushi restaurant sets out a bottle of regular soy sauce, which contains wheat. This sauce is used for dipping sashimi and nigiri, dressing rolls, and flavoring many kitchen preparations. Every other gluten concern at a sushi restaurant is secondary to this one.
What Is Safe to Order
Sashimi is your safest option. Fresh fish sliced and served without rice, seaweed, or sauces is inherently gluten-free. Bring tamari packets from home or ask whether the restaurant carries tamari.
Nigiri (fish on rice) is safe if the rice is seasoned only with rice vinegar, sugar, and salt—the traditional preparation. Some restaurants add soy sauce to the rice or to the fish before serving. Ask specifically.
Cucumber rolls (kappa maki) and avocado rolls made with plain vegetables, fish, and nori are safe if no sauces are added. Confirm that soy sauce was not used in the kitchen preparation.
Edamame is always safe. Miso soup made from plain miso paste and dashi is usually safe, but confirm the broth contains no soy sauce.
What to Avoid
Imitation crab (surimi): used in California rolls and many other popular rolls. Imitation crab is made from fish and wheat starch. Real crab is gluten-free; imitation is not.
Tempura: wheat flour batter. All tempura items contain gluten—tempura shrimp rolls, tempura flakes (crunchy rolls), and tempura vegetables.
Eel sauce (unagi sauce): made with soy sauce, sugar, and mirin. Used on eel rolls and many specialty rolls. Contains gluten.
Spicy mayo: typically made with mayonnaise and sriracha, which are gluten-free. However, some restaurants add soy sauce. Ask to confirm.
Teriyaki sauce: always contains soy sauce, therefore always contains gluten.
Ponzu: typically citrus and soy sauce. Contains gluten unless specifically made with tamari.
The Soy Sauce Solution
Carry small bottles of tamari. San-J and Kikkoman both make travel-size tamari packets. Bring these to sushi restaurants and use them in place of the soy sauce provided.
When you sit down, move the soy sauce bottle away from your place setting and explain to your server that you have a soy sauce allergy (this communicates the issue more clearly than "gluten-free" in many sushi restaurants). Ask whether tamari is available.
Some sushi restaurants, particularly those that cater to a health-conscious clientele, stock tamari. It is worth asking.
Cross-Contamination Concerns
The chef's hands may transfer soy sauce from one preparation to another. At a sushi bar where you can see the chef, ask them to change gloves before preparing your order.
Shared dipping dishes: if your dining companions are dipping in soy sauce, ask for your own small dish for tamari. Their soy sauce should not come in contact with your food.
The rice paddle and other tools are shared across all preparations. For strict celiac safety, ask that the chef rinse or clean tools before making your order.
Communicating Your Needs Effectively
At the server level: "I have celiac disease. I cannot have soy sauce, imitation crab, tempura, or any sauces made with soy. I have brought my own tamari. Can you help me identify what's safe?"
At the chef level: use the phrase "wheat allergy" alongside celiac disease. Request gloves be changed. Ask specifically about each roll whether any sauce is used in the kitchen preparation.
The most reliable safe meal at a sushi restaurant: fresh fish sashimi, edamame, and plain cucumber or avocado rolls, with tamari you provided. Simple, delicious, and safe.