Wash scallions, then pat dry with paper towels thoroughly. Trim off the ends. Cut them into long sections, then halve each piece lengthways.
Infuse the oil
Pour oil into a wok/skillet, and add the scallions. Leave to fry over medium-low heat. Once the white part of scallions becomes golden brown, take them out with chopsticks leaving the oil in the wok.
Make the sauce
Turn off the heat and allow the oil to cool for about a minute. Then, carefully pour in the mixture of light soy sauce, dark soy sauce, and sugar. Mix and let the remaining heat of the oil dissolve the sugar completely (see note 2 & 3).
Cook the noodles
Bring plenty of water to a full boil. Add noodles and leave to boil until they’re cooked through.
Assemble the dish
Transfer the drained noodles to the wok. Stir and toss to evenly coat each strand with the sauce.
Portion out the noodles into 4 serving bowls, or put them on a large plate for sharing. Garnish with the fried scallions.
Video
Notes
1. Apart from the traditional choice of Chinese wheat noodles, feel free to use rice noodles, soba noodles, or even Italian spaghetti.2. If the oil isn’t hot enough and no bubbles appear when you pour in soy sauce and sugar, turn on the heat to heat up briefly.3. You can make the sauce in a big batch and store it in the fridge for 1 month. However, the fried scallions need to be consumed in 3 days.