In a large mixing bowl, whisk together the flour, cornstarch, salt, egg, and ice-cold water until a smooth batter forms.
Add the chopped garlic chives to the batter and toss gently to ensure the vegetables are evenly coated.
Heat 1.5 tablespoons of cooking oil in a large non-stick skillet over medium-high heat.
Pour half of the batter into the skillet, spreading it thinly and evenly with a spatula. Cook for 3 to 4 minutes until the bottom is golden brown and crispy.
Flip the pancake carefully and cook the other side for another 3 minutes, pressing down lightly. Repeat with the remaining batter and oil.
Whisk the soy sauce, rice vinegar, sesame oil, and sesame seeds in a small bowl to make the dipping sauce. Slice the pancake into wedges and serve immediately.