01 - Whisk together all-purpose flour, rice flour, salt, egg, and cold water in a large bowl until smooth batter forms.
02 - Gently fold scallions, carrots, onion, and any optional add-ins into the batter until evenly distributed.
03 - Heat 1 tablespoon vegetable oil in a large non-stick skillet over medium-high heat until shimmering.
04 - Pour one-quarter of batter into skillet, spreading evenly into thin round. Cook 3-4 minutes until golden and crispy, then flip carefully and cook 2-3 minutes until second side is golden.
05 - Repeat with remaining batter, adding more oil as needed between pancakes.
06 - Combine soy sauce, rice vinegar, sesame oil, sugar, chopped scallion, and gochugaru in small bowl, mixing until sugar dissolves.
07 - Slice pancakes into wedges and serve immediately with dipping sauce on the side.