The clever science behind frozen ramen

Instant ramen might be a hunger beater, but they are little like the real thing. However, food scientists can make them much more like restaurant noodles with one new step – freezing.

A noodle is a delicate thing. Shinji Sasaki would be the first to tell you. Too porous, and it will get soggy. Too dense, and it won’t cook evenly. Behind all the noodles you toss into a boiling pot of water, there’s probably a team of food scientists like him, employed by the manufacturer to calculate the precise ingredients and chemistry required to achieve the desired effect.

And Sasaki has another tricky layer or two to work with: as a food scientist at Ajinomoto Foods, he is one of the people behind an unusual processed food that can be found lining grocery freezer shelves. These are frozen ramen bowls, ready for the office microwave. When noodles have to be cooked, frozen, and then microwaved, the bar is set very high for the scientists hoping to make a quick ramen lunch palatable.

Instant ramen, of course, has a beloved place in many hearts. The comforting bounce of noodles that have been fried and dried and rehydrated, the bite of the salty soup packets, the swift transformation from brittle puck to savory snack – what’s not to like? It doesn’t have very much in common with ramen made fresh in a shop, though. And as American palates learned what these noodles could be like in recent years, following a groundswell of ramen shop openings, the company began to ponder producing something closer to the fresh version, recounts Taro Komura, an executive vice president at Ajinomoto Foods North America.

Because instant ramen has to cook swiftly when the hot water is poured over it, the noodles are designed with plenty of space within each strand. “The internal structure of the instant noodle is porous,” Sasaki says, so that water can rush in and saturate it quickly. From the perspective of Ajinomoto and its goal of delivering a better ramen, the best way to get a fresh-tasting noodle to the customer was to cook it, then freeze it. That required a technically different approach from instant noodles. Porous noodles don’t age well, as anyone who’s forgotten a cup of noodles in the microwave can relate. The resulting mess is swollen and soggy.

An added danger to the noodles’ integrity, Sasaki adds, is that while Japanese eaters slurp piping-hot noodles very quickly, not everyone is so fast. Sitting in the soup is a problem.

So, he and his colleagues aimed for a noodle that was the opposite of the instant version – one that was very dense. The process that they developed starts with a fairly standard ramen dough. But then the dough is run through a series of rollers covered in grooves, which press the air bubbles out of the dough as if they were toothpaste in a tube. The rollers also produce a fine, smooth texture on the dough sheet – the scientists checked it using a microscope.

That smooth surface makes it more difficult for water to penetrate the noodle’s structure. Stacking three of these sheets atop each other, then rolling them out leads to noodles that are significantly denser than normal ramen. They can stand up to being cooked twice: once in the factory, where they are cooked, arranged into little nests with seasonings and toppings, packaged up, and frozen, and once in the microwave, where four minutes gives the office dweller a hot bowl of noodles.   

The engineering required to produce this effect is far from minimal. The pooled expertise of an entire team of food scientists, people who’ve spent decades getting to know the inside of a noodle, from the molecule upwards, went into that frozen package. (In fact, Ajinomoto has patented the roller system.)  

The seasonings, that other distinctive feature of the ramen, are likewise complex. But in a way, freezing simplifies the team’s goal.

Ramen soup is traditionally made of two components: a broth using seaweed, dried mushrooms, fish, or meat, and a pungently salty flavouring, like miso or soy sauce.

“When building flavour during the cooking process, there’s a scientific reason why certain combinations and pairings in ramen taste so delicious,” says Sasaki. “When you combine kombu [seaweed] or MSG, which contain glutamate, plus meat, which contains inosinate, and dried shitake mushrooms, which contain guanylate, each part interacts with each other to intensify the flavour. Umami is enhanced by synergistic interactions of glutamate with (the) nucleotides inosinate and guanylate.” (Read more about the science of umami in an earlier column here.)

In instant ramen, some of that depth is lost because when the seasonings are dried, aromatic components can become volatile and float away. Frozen is a different story, however. More of what’s lovely about a fresh restaurant ramen broth survives, Sasaki says, because freezing does not lead to the same disruptions.