Tempura batter is traditionally made with what type of water?

Tempura batter is traditionally made with ice-cold water. The low temperature helps keep the batter light by slowing the development of gluten in the wheat flour, producing the fragile, crisp coating associated with well-made tempura.

A basic batter commonly combines iced water, egg, and soft wheat flour. It is mixed only briefly, often with chopsticks, so small lumps remain. Overmixing smooths out the batter but also develops more gluten, which can make the fried coating tougher and more dough-like. Keeping the bowl over ice is another traditional way to maintain the batter’s temperature during cooking.

Sparkling water is sometimes used in modern recipes because dissolved carbon dioxide can contribute to a lighter texture, but it is not the traditional requirement. Room-temperature water can work, especially in casual cooking, yet it does not provide the same temperature advantage. Tempura also differs from panko-coated foods: its crispness comes from a thin flour batter, not breadcrumbs.