Sift together flour, cornstarch, baking soda, baking powder, and salt.
When ready to fry, gradually mix in ice-cold water. Stir gently until smooth. Don't overmix—small lumps are fine.
Pat fish, chicken, or vegetables dry. Dip in batter, coating evenly. Let excess drip off.
Heat oil to 350°F (175°C). Fry in batches until golden brown and fully cooked.
Remove from oil and place on a wire rack to keep crispy
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