Wash green onions and pat dry with paper towels. Trim off the roots, split vertically and chop into 2-inch pieces. Transfer to a large mixing bowl.
Add all remaining batter ingredients into the bowl and mix just until combined. Do not over mix.
Heat 2.5 tablespoon of vegetable oil in a large non-stick pan on medium-high heat and swirl to coat.
Add green onions from the batter to the pan first and spread evenly. Scrape the remaining batter to fill any holes.
Reduce heat to medium and fry until the bottom is crispy and golden with slight charring on the onions, about 4-5 minutes.
Flip with a large spatula, pour remaining oil around the pancake, occasionally swirl and press down on it while cooking.
Transfer the pancake to a cutting board and slice into small pieces.
In a small bowl, mix all dipping sauce ingredients. Serve the pancake with the dipping sauce and enjoy.