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1
Prepare the tsuyu first. Combine the ichiban dashi, mirin, and soy sauce in a small saucepan in a 4:1:1 ratio. Add the konbu strip. Bring to a gentle simmer over medium heat. Remove the konbu before the liquid boils. Hold warm. The sauce is ready when it carries a clear amber colour and a clean mineral-saline aroma.
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2
Heat the frying oil in a deep, heavy pot to 175°C. Confirm the temperature by dipping a wooden chopstick into the oil — small bubbles rising continuously from the tip indicate the correct heat. Alternatively, drop a small amount of batter into the oil: it should sink halfway, then rise immediately. Do not proceed until this test is satisfied.
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3
Make the tempura batter immediately before frying — never in advance. Beat the egg lightly into the ice-cold water. Add the sifted flour in one addition. Mix with a few strokes only: three to four passes with chopsticks or a fork. The batter will be thin, uneven, and visibly lumpy. Lumps are correct. The bowl should remain cold throughout; keep it nested in a larger bowl of ice.
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4
Combine the shrimp and thin-sliced negi in a separate bowl. Add just enough batter to coat loosely — the mixture should barely hold when scooped on a large spoon. This is the structural balance on which the dish lives or dies: too much batter produces a dense, doughy mass; too little causes the mixture to fall apart in the oil. The correct consistency is a shaggy, barely bound aggregate with ingredients visibly protruding.
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5
Working in small batches of no more than two kakiage at a time, scoop the mixture with a large spoon and slide it gently into the oil without compressing. The form is rough and irregular; do not press or shape. Fry for 2–3 minutes, turning once, until the batter lattice is pale gold and audibly crackling. Frying too many pieces simultaneously lowers the oil temperature and destroys the crispness.
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6
Lift the kakiage with a mesh skimmer and drain briefly on a rack — never on paper, which steams the underside. Collect any tenkasu (loose batter drops) from the oil surface with the mesh skimmer and reserve separately. The finished kakiage should shatter audibly under light pressure and present a lace-like batter lattice of pale amber.
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7
Serve immediately — tempura deteriorates within three minutes as steam from the interior condenses against the batter crust. Place the kakiage directly on a folded sheet of washi or white paper on the plate. Serve the warm tsuyu in individual cups alongside grated daikon and grated ginger for the diner to stir in to taste.