Mix just until no dry flour remains, taking care not to overwork the batter.
Stir in the kimchi, scallion, and onion.
Add the sugar if the kimchi is very sour, then mix to combine.
1 tablespoon sugar
Heat a large skillet over medium-high heat and add a generous amount of oil.
vegetable oil
When the oil is shimmering, ladle in some batter and spread it into a thin layer.
Cook until the edges are browned, then carefully flip.
Press lightly with a spatula and cook until golden and crisp on both sides.
Repeat with the remaining batter and serve immediately.
Notes
Using very cold water helps create a crispier texture.The batter should be loose and pourable, not too thick, so the pancakes cook up thin and crisp.The kimchi juice provides the seasoning, so there is no need to add salt.If the batter is too thick, loosen it with a little water; if it is too runny, add a little flour.A very hot skillet and enough oil will give the pancakes a beautifully golden, crispy surface.Well-fermented kimchi brings deeper flavor; if the acidity is too pronounced, a little sugar helps balance it.