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Tempura batter is a light, crispy coating used in Japanese cuisine for deep-frying seafood, vegetables, or other ingredients. It's made from a simple mixture of cold water, flour, and sometimes egg, designed to create a delicate, airy crust. This technique was introduced to Japan by Portuguese missionaries in the 16th century and has since become a staple of Japanese cooking.
Tempura batter is high in carbohydrates from the flour and fat from the deep-frying oil, with minimal protein unless the coated ingredient is protein-rich. A typical serving of tempura (about 100g) can range from 200 to 300 calories, depending on the oil absorption and ingredients used.
The secret to perfect tempura lies in keeping the batter cold and minimally mixed to avoid gluten development, which ensures a light, non-greasy texture. Nutritionally, while it's a fried food, the quick cooking method at high heat helps retain more of the natural nutrients in the vegetables or seafood compared to longer cooking processes.