To achieve light and crispy tempura, use ice-cold ingredients, avoid overmixing the batter, and fry at the correct temperature. This prevents gluten development and ensures a delicate, airy coating.
The key to perfect tempura lies in preventing gluten formation in the batter. Gluten makes the batter tough and heavy, leading to a soggy result. Here's a step-by-step guide:
Use Ice-Cold Ingredients: Start with ice-cold water (or sparkling water for extra lightness) and keep all ingredients chilled. This slows down gluten development.
Combine Dry Ingredients: In a bowl, whisk together equal parts of all-purpose flour (or tempura flour) and cornstarch (or potato starch). The cornstarch helps create a lighter, crispier texture.
Gently Mix Wet and Dry: Add the ice-cold water to the dry ingredients. Use chopsticks or a fork to lightly combine. The batter should be lumpy and slightly uneven. Overmixing develops gluten, which is what we want to avoid.
Keep the Batter Cold: Place the bowl of batter in a larger bowl filled with ice water to maintain its cold temperature while you're frying.
Fry at the Right Temperature: Heat your oil (vegetable, canola, or peanut oil work well) to 350-375°F (175-190°C). Use a thermometer to ensure accuracy.
Dust Ingredients Lightly: Before dipping, lightly dust your ingredients (shrimp, vegetables, etc.) with flour or cornstarch. This helps the batter adhere better.
Fry in Small Batches: Don't overcrowd the fryer. Fry in small batches to maintain the oil temperature. Overcrowding lowers the temperature and results in soggy tempura.
Remove and Drain: Once the tempura is golden brown and crispy, remove it from the oil and place it on a wire rack to drain excess oil. Avoid using paper towels, as they can trap steam and make the tempura soggy.
Don't prepare the batter too far in advance. Make it right before you're ready to fry. The longer the batter sits, the more gluten will develop, leading to a less crispy result.