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1
Whisk flour, dashi, egg, baking powder, and sea salt together until a thick, smooth batter forms; let rest 5 minutes.
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2
Heat 22 ml neutral oil in a 25 cm non-stick skillet or takoyaki pan over medium-high heat for 1 minute until shimmering.
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3
Pour half the batter onto the skillet; spread to a thin, even 1 cm layer; immediately layer napa cabbage, shrimp, and pork belly on top in distinct strips.
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4
Once the base begins to set and edges crisp slightly (2–3 minutes), carefully slide the spatula under the okonomiyaki and flip; press gently with the spatula.
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5
Drizzle the uncooked side with remaining batter to bind the toppings; cook for another 2 minutes until the second side is set and ingredients are warm.
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6
Transfer to a cutting board; slice into 8 wedges using a takoyaki pick or chopstick.
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7
Arrange wedges on a warm plate; drizzle with okonomiyaki sauce in a crosshatch pattern, pipe Kewpie mayonnaise in parallel lines, and scatter bonito flakes and aonori over the top.
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8
Serve immediately while the bonito flakes curl from the heat.