Cook your noodles of choice according to package directions.
To a large heat-proof bowl, add the scallions, ginger, garlic, crushed red chilli flakes or gochugaru, and toasted sesame seeds.
Heat 4 tbsp of any neutral flavoured oil until smoking, then pour it over the ginger-scallion mixture.
Once the bubbling and sizzling has subsided, give it a gentle stir to ensure that the oil is evenly mixed in.
Now stir in the remaining ingredients: light soy sauce, dark soy sauce, rice vinegar/ lime juice, miso (optional), chilli oil/ hot sauce (optional), and brown sugar (optional).
Add your noodles, tossing to ensure that they are evenly coated with the ginger-scallion oil.
Serve hot, garnished with more scallions/ spring onions.
