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1
Combine the cold egg and ice-cold water in a bowl, then add the sifted flour in one addition. Stir minimally—four or five strokes—leaving the batter visibly lumpy. It must remain cold throughout. The batter is ready when it just coats a chopstick in a thin, uneven film.
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2
Place all prepared seafood and vegetables in a wide bowl. Add only enough batter to lightly bind them—approximately three to four tablespoons per fritter's worth of filling. Toss gently. The ingredients should be barely moistened, not coated. This is where the dish lives or dies: more batter produces a dense, doughy mass; too little and the fritter will not hold. The mixture should look loose and shaggy, with batter just visible between the ingredients.
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3
Heat the oil to 180°C. Verify the temperature with a drop of batter: it should sink slightly, then rise and crisp within three seconds. Below 180°C the fritter spreads before setting; above it, the exterior over-browns before the interior cooks.
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4
Gather one portion of the mixture loosely with chopsticks into a rough round bundle. Slide it gently into the oil at a 45-degree angle, releasing it just at the surface so it floats together rather than scattering. For the first 30 seconds, nudge the edges inward with chopsticks if needed. Do not press the fritter flat. The batter has set when the bundle holds its irregular, round shape without prompting.
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5
Fry, turning once, until the exterior is pale gold and the edges are visibly lacy and crisp. The fritter is done when it sounds hollow and dry when tapped lightly—the sizzling will have quietened from an aggressive crackle to a steady, low hiss. Lift out and drain briefly on a rack, never paper, to preserve the open structure.
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6
Place the freshly fried kakiage immediately atop the portion of hot soba or udon in its broth. Serve at once. The fritter softens within minutes of contact with the soup; the defining contrast between crisp exterior and steamed interior exists only in the first moments after frying.