Scallion oil noodles (cong you ban mian) are a Shanghai classic built on almost nothing: noodles tossed in fragrant scallion oil and a sweet, savory soy sauce, with the browned scallions scattered back on top. There is no meat, no vegetables to speak of, and yet the smell alone will pull people into the kitchen. It is proof that a couple of cheap ingredients, treated with a little patience, can beat almost anything you would order out.

It is worth knowing because it costs next to nothing, keeps for ages, and scales beautifully: you make a batch of scallion oil once and it flavors noodles for weeks. The entire dish rests on one technique, cooking the scallions slowly in oil, so that is where the attention goes.

What you need #

• Green onions, a big bunch, cut into long segments. You want more than feels reasonable, because they cook down.
• Oil, enough to submerge the scallions as they fry. A neutral oil.
• Soy sauce (a mix of light and dark if you have it), and a little sugar to balance it.
• Noodles, any wheat noodle you like, fresh or dried.

The steps #

1. Make the scallion oil, low and slow. Put the green onions in cold oil and turn the heat to low. Let them fry gently, stirring now and then, for ten to fifteen minutes until they turn deep golden brown and crisp. Low and slow is the whole secret. Rushing on high heat burns them and wastes the point.
2. Save the scallions and the oil separately. Fish out the browned scallions and set them aside. Keep the fragrant oil, which is now the flavor base.
3. Make the sauce. Stir soy sauce with a spoon of sugar until it dissolves. Warming it briefly in a little of the scallion oil melts the sugar and rounds it out.
4. Cook the noodles in boiling water until just done, then drain.
5. Toss and top. Toss the hot noodles with a few spoons of scallion oil and the soy sauce mix until every strand is coated and glossy. Pile the browned scallions back on top and eat.

Swaps, simplifications, and upgrades #

• The sauce: dark soy sauce adds color and a deeper, slightly sweet note, while light soy sauce adds saltiness. A splash of oyster sauce makes it richer. Adjust the sugar to your taste.
• Make it a meal: this is traditionally a light dish, but a fried egg on top, some blanched greens on the side, or a handful of cooked shrimp turns it into dinner.
• The noodles: thin wheat noodles are classic, but it works with almost any noodle you have, including instant noodles minus their seasoning packet.
• Batch the oil: make a big jar of scallion oil at once and store it. It keeps well and instantly upgrades noodles, rice, dumplings, or steamed vegetables any night you are in a hurry.
• Add aromatics: some people fry a few slices of shallot or ginger along with the scallions for extra depth. Optional, but nice.

Tips #

• Keep the heat low. The single mistake people make is frying the scallions too hot. You want them slowly browned and crisp, not scorched. Patience here is the entire dish.
• Do not throw the oil away. The oil is the product. The crispy scallions are a bonus topping.
• Coat, do not drown. Add the oil and sauce a little at a time and toss, so the noodles are glossy and seasoned rather than swimming.

A bunch of green onions, some soy sauce, and noodles: one of the cheapest, most fragrant bowls you can make. It is the whole philosophy of cheap SF living in a single dish. For another minimalist classic, try the silky steamed egg.