Cao Lầu — Hoi An Pork & Noodle Bowl

Cao lầu is a regional noodle dish unique to Hoi An, in central Vietnam, found almost nowhere else. It features thick, chewy, slightly smoky noodles topped with slices of five-spice char siu-style pork, fresh herbs, bean sprouts and crunchy fried-noodle croutons, with only a small amount of intense broth — it's a dry-ish bowl that you toss together, not a soup. Its blend of Chinese, Japanese and Vietnamese influences reflects Hoi An's history as an international trading port. It's one of Vietnam's most distinctive and beloved local specialities.

Authentic cao lầu noodles are famously made only in Hoi An, traditionally using water drawn from a specific ancient well (the Ba Le well) and lye ash from trees on the nearby Cham Islands, which give them their unique chewy, springy texture and pale tawny-grey colour. This is why true cao lầu is said to be impossible to replicate exactly elsewhere. Outside Hoi An, cooks use the closest available thick noodle — most often thick udon — to approximate the signature bite, since the real noodles are so local.

No — that's a key thing to know. Unlike pho or many Vietnamese noodle soups, cao lầu is a dry-ish dish with only a small amount of concentrated, savoury broth pooled at the bottom — just enough to moisten and flavour the noodles, not to fill a soup bowl. You toss everything together before eating so the noodles, pork, herbs and crispy bits all coat in that little bit of broth. Think of it as a mixed noodle bowl rather than a noodle soup.

Since genuine cao lầu noodles are essentially impossible to get outside Hoi An, the most practical and common substitute is thick udon noodles, which have a similar chewy, springy texture. Some cooks use thick fresh rice noodles or even soba for colour. It won't be identical to the real thing — the authentic noodles are part of what makes cao lầu unique — but thick udon gives you the closest experience of the chewy noodle and lets you enjoy the dish's flavours and textures at home.

The crunchy croutons are a defining texture of cao lầu — small pieces of the noodle dough (or extra noodles) deep-fried until crisp and golden, scattered over the bowl. They add a contrasting crunch against the chewy noodles and tender pork. Some versions use crisp-fried wonton-like crackers. Along with the generous pile of fresh herbs and bean sprouts, these crispy bits are essential to the dish's signature interplay of textures, so don't leave them out.