1 large spring onion, trimmed and roughly chopped
70²µ/2½´Ç³ú plain flour
½ tsp baking powder
1 tbsp cornflour
pinch gochugaru, or other red chilli flakes
½ tsp rice wine vinegar
pinch sea salt
½ tsp toasted sesame oil
½ tbsp soy sauce
1 tbsp vegetable oil, plus extra for frying
1 large free-range egg yolk
150²µ/5½´Ç³ú kimchi, roughly chopped, plus 1½ tbsp kimchi juice (from the jar)