Is tempura gluten-free in Japan?

The short answer

Classic tempura is not gluten-free. Three things put wheat in the dish: the batter is made from soft wheat flour, the warm tentsuyu dipping sauce is built on dashi plus soy sauce (ordinary soy sauce is brewed with wheat) and mirin, and the prawns or vegetables are lowered into oil shared with breaded, battered items all night long. For a coeliac diner, that shared fryer alone is enough to rule a normal tempura counter out.

Why "just vegetables" still isn't safe

Even vegetable tempura is coated in wheat batter, so it is no safer than the prawn version. Tonkatsu, korokke and karaage cooked in the same oil leave wheat behind, and a dusting of flour is often used before the batter goes on. This is the same wheat-everywhere problem covered in our gluten-free Tokyo guide and is sushi gluten-free?.

Where gluten-free tempura is real

A small number of Tokyo specialists do it properly: they batter and fry in 100% rice flour, use a dedicated fryer, and serve tamari (wheat-free soy sauce) or salt instead of regular tentsuyu. The venues below are our verified picks. Dedicated gluten-free kitchens and rice-flour kushiage counters use the same approach.

How to order safely

Say "komugi arerugi" (wheat allergy) and ask whether the batter is kome-ko (rice flour) and the oil is separate. Cross-contamination matters more than any single ingredient, so confirm with the venue before you order — they will appreciate the heads-up.