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1
Whisk together flour, water, 1 egg, salt, and white pepper until smooth batter forms; let rest 5 minutes.
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2
Pat vegetable pieces dry with paper towels; toss in small bowl with salt and white pepper.
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3
Heat 15 ml oil in large non-stick skillet over medium-high heat until shimmering; arrange green onion pieces in single layer (use half for first batch).
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4
Pour 60 ml batter evenly over vegetables; cook 3 minutes undisturbed until bottom is golden and crisp.
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5
Beat 2 eggs in small bowl; pour over top of pajeon and flip carefully onto oiled surface; cook remaining 3 minutes until second side crisps; transfer to cutting board and cut into strips.
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6
Repeat process with remaining batter, vegetables, and 15 ml fresh oil to form second pajeon.
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7
Whisk soy sauce with rice vinegar for dipping sauce; serve pajeon hot, sprinkled with white and black sesame seeds, alongside dipping sauce.