Hakata tonkotsu: pork bones, thin noodles and the art of the refill

The first thing you notice about a Hakata ramen shop, often before you can see it, is the smell. Pork bones boiled for hours give off a powerful, unmistakable aroma, and some first-timers find it a little alarming. Push through the curtain anyway. What waits inside is one of the great bowls of Japan: a creamy, milky-white pork soup over noodles finer than most spaghetti.

The broth that looks like milk

Hakata is the old merchant heart of Fukuoka, the biggest city on the southern island of Kyushu, and its ramen is the textbook example of tonkotsu (豚骨), which simply means "pork bone".

The technique is all about force. Pork bones are boiled hard, at a rolling boil rather than a polite simmer, for many hours. All that agitation breaks down collagen, marrow and fat and churns them into the water until the stock turns opaque and creamy. It looks almost like milk and coats your lips the way a good gravy does. As with any ramen, a seasoning base called tare goes into the bowl first; I explain how the parts fit together in the four big flavours.

The cloudy style wasn't always the norm. Kurume, another city in Fukuoka Prefecture, is often cited as the birthplace of tonkotsu ramen, and a stall called Nankin Senryo (南京千両), commonly dated to 1937, is the name usually given as the first. Early bowls are said to have been clear. The story goes that the milky version began by accident, when a pot boiled harder than intended and the cooks liked what they found. Like most food legends, it's impossible to prove and far too good not to repeat. Neighbouring Kumamoto has its own garlicky branch of the family, which I cover in Kumamoto ramen.

Noodles in a hurry

Hakata noodles are very thin and straight, and they're made with relatively little water in the dough, so they cook in a matter of seconds. That speed shapes the whole experience.

A story often told is that thin, fast noodles suited the workers around Fukuoka's Nagahama fish market, who wanted something hot and filling without waiting. Whatever the truth of it, the consequence is real. Thin noodles soften quickly in hot soup, so shops serve a modest portion and let you order more. Which brings us to the ritual.

How to order: firmness and refills

In most Hakata shops you'll be asked how firm you want your noodles. The scale runs roughly like this, from barely cooked to soft:

• Kona-otoshi (粉落とし): "knock the flour off", barely through the water
• Harigane (ハリガネ): "wire"
• Barikata (バリカタ): very firm
• Kata (カタ): firm
• Futsū (普通): regular
• Yawa (やわ): soft

Not every shop offers every level, and the names vary a little. If you're unsure, kata or futsū will never steer you wrong. I think a bit of firmness suits these noodles, because they keep softening as you eat.

When your noodles are gone but you still have soup, ask for kaedama (替え玉): a fresh portion of noodles, boiled to order and dropped straight into your bowl. Some shops take the order by ticket or a little paper slip instead of a shout. A few practical tips:

• Leave plenty of soup. The refill needs somewhere to swim.
• Order a little early. Ask before you've quite finished, so the new noodles land while the soup is still hot.
• Re-season if you need to. Each refill dilutes the soup slightly, and some shops keep a bottle of seasoning on the counter for exactly this.

The condiment tray

Hakata ramen arrives fairly plain: usually thin slices of chashu, a scatter of chopped green onion and perhaps some kikurage (wood ear mushroom). The real customisation happens at the table, where you'll often find:

• Beni shoga (紅生姜): bright red pickled ginger, sharp and refreshing
• Karashi takana (辛子高菜): spicy pickled mustard greens. Go carefully; they can be fiery, and they change the soup fast.
• Sesame: sometimes whole seeds, to grind over the bowl yourself
• Garlic: sometimes fresh cloves with a press

My advice is to taste the soup as it comes first, then add one thing at a time, ideally around the moment you order your refill. That way your second portion becomes a slightly different bowl from your first.

Bowls under the open sky

Fukuoka is also famous for yatai (屋台), the small open-air food stalls that set up in the evening along the river and around the city centre. Ramen is a classic yatai dish, and eating a bowl elbow to elbow at a tiny counter is one of the city's great pleasures. There's more on that in Fukuoka's yatai, and you can find tonkotsu shops through our Hakata search or on the Fukuoka city map.

Hakata ramen is simple to describe and hard to forget: rich soup, quick noodles and the freedom to keep going. For me, the real genius is the refill. It turns a bowl of noodles into a conversation, and you decide when it ends.