Do you enjoy wasabi with your sushi? If you dine at sushi bar restaurants here in the United States, chances are the vast majority of green wasabi paste served is not real fresh wasabi, but rather regular horseradish with green food coloring. Today’s guest post is from my friend Tim Mar, owner of an online foods store, Chef Shop based in Seattle, Washington. They feature and support the small family owned, artisan producers that make amazing products like Amabito No Moshio – ancient sea salt from Japan.

Tim sells fresh wasabi grown by locally-grown wasabi family farmers Brian, Laurencia and daughter Aleena. The crops are grown in three locations in North America, whose exact locations are kept a secret because U.S. grown wasabi is incredibly rare and valuable. There is such a high failure rate in wasabi farming that Brian must keep his location and harvest schedules confidential.

Enjoy the article below! ~Jaden

What is Fresh Wasabi? 

by Tim Mar

Ever wondered why Wasabi, that fiery green paste and indispensable sushi accompaniment, tastes so much like horseradish?

Here’s why: because it IS horseradish.

Although we’ve learned to call it Wasabi, what we’re served in sushi restaurants in North America – and largely in Japan, too – is nearly always a mixture of horseradish and green dye, with perhaps a little hot mustard, with possibly a very little bit of real Wasabi added in. That’s right… fake wasabi.

Why not offer the real deal? Because real wasabi root, Wasabia japonica, is very rare. Even in its native Japan, demand constantly outstrips supply, and it’s expensive to import and notoriously tricky to grow.

True wasabi is a rare find and an unmatched taste experience.
And here it is…

The Secret Wasabi Grotto

It’s a chilly, gray morning in May here in the Pacific Northwest, and I’m peering through dark-colored shade tarp walls into a long greenhouse. Inside, a thick, lush carpet of wasabi plants extending from one end to the other, almost ready to be harvested. There’s barely room to pick a pathway through the sea of green.

We are here to talk with Wasabi Meister, Brian, his wife, Laurencia, and their 10-year-old daughter, Aleena, who met us at one of their prime wasabi-growing sites. As Aleena leads us into the greenhouse, the rich, heavy, green smell of the damp plants envelops us. We watch as Brian selects a big, bushy plant that’s ready for harvest, after years of growing.

Loosening it from the ground with a hoe he pulls it up, leaves, roots and all, and carries it outside to a cleaning and prep station conveniently set up right outside the greenhouse.

After a brisk washing in lots of cold water, Brian deftly trims away the leaves (which he saves; they’re edible too – and delicious!), cuts off the roots, and holds out a knobby, 3-inch-long, greenish, root-like object: the coveted real wasabi rhizome.

The rhizome, which is a root-like stem that grows above ground, is the part of the plant that’s grated to make wasabi as we know it – that is, wasabi as we’re used to seeing it but not tasting it!

Aleena, their daughter, proudly does the honors of grating the wasabi. Traditionally a sharkskin grater is used and is still considered optimal, but ceramic works well, too. (We’ve also found that A MICROPLANE zester will work for some applications, although it does not mash the fresh wasabi rhizomes, which is ideal.)

In a minute, Aleena amasses a little pile of grated wasabi, a lovely, light shade of green. (It really is green; the color comes from chlorophyll, since despite its root-like appearance, the rhizome grows above ground.) She pushes the shavings into a neat little pile, and then we let them rest for one to two minutes. This allows the wasabi’s flavor to develop; the flavor-producing compounds react following grating and exposure to the air. They’re extremely volatile, though – meaning that fresh wasabi loses its pungency and hot flavor in about 20 minutes. It must be eaten freshly grated!

Finally, on the tip of a chopstick, we taste the freshly grated wasabi rhizomes. It’s a revelation – like nothing I’ve ever tasted. It’s strong and hot, but with no harshness and no lasting burn. Plus, it tastes green, herbal, distinctly plant-like (unlike the imitation version); it’s a very clean, delicate flavor.

The Joys of Real Wasabi

Just imagine this with a sushi plate – but that’s not all. Imagine it with grilled fish, as an great addition to fresh lump crab salad, dotted atop steaming mashed potatoes, or along a plate like a coulis. From steak to fresh vegetables, it’s a brilliant accompaniment. And you can’t get it anywhere else!

But wait, there’s more: don’t forget the wasabi leaves and their long stems!

The large, heart-shaped leaves and crisp stems, known as petioles, are edible and excellent. Pleasantly spicy, resembling spicier varieties of salad greens but with a distinct hint of wasabi flavor, they’re flavorful and refreshing (and the touch of heat fades quickly, as with the grated rhizome). Even more than the rhizomes, the leaves are extremely rare outside of Japan. What better touch for your next springtime dinner party than a wasabi-leaf salad?

Chefs are Crazy About Fresh Wasabi

Brian and Laurencia are finding an enthusiastic audience among local chefs that’s particularly interested in their recently available fresh wasabi. They also work with chefs from around the world and in some of the finest restaurants; from the Pacific Northwest, with its terrific culinary scene and strong Asian-Pacific influences, to the U.S. and Europe. And a number of chefs at Michelin-rated restaurants are customers, even as far away as South Africa where one chef brings wasabi to the table for customers to grate themselves for that fresh wasabi flavor! Wasabi is particularly suited for table-side service, since its flavor fades quickly. In addition to accompanying sushi and sashimi, chefs are serving wasabi with oysters, with steak, and to flavor soufflés, just to name a few!

How to Store Your Wasabi

Rhizomes: One way is to individually wrap each rhizome in a damp paper towel and then store them in a bowl, uncovered, in the fridge. Do not use plastic; the rhizomes need air circulation. Keep the paper towels damp, and rhizomes will store well for a couple of weeks. Morimoto explained to me, in Aspen at the Food and Wine Classic, that we should store the rhizomes in ice water, changing the water daily. The rhizomes will darken around the edges, but you can just scrape off outermost layer with a vegetable peeler before grinding.

Leaves and Petioles (Stems): These store very well in the fridge for about 10 days. Wash leaves and petioles and leave them moist; store in a plastic zip-type bag.

Preparing Fresh Wasabi

Preparing real wasabi paste to eat is a snap – and it’s fun, too! Start by washing the rhizome and trimming any bumps. Then trim the root-end (holding the leafy end upright) for a fresh surface, and grate wasabi into a small pile. Let it rest one to two minutes for flavors to develop, and then serve!

NOTE: Wasabi loses its flavor very quickly – in about 15-20 minutes when exposed to air – so gathering the shavings into a ball not only keeps it together for easy use as a condiment, but minimizes exposure to air.

TIP: You can freshen up wasabi that has lost its flavor by grating on a little fresh wasabi into the pile and gathering it all into a ball again, rolling it between your fingers. Wasabi should be “sticky;” it should easily stay in a ball-shape.

How Fresh Wasabi Ended Up In The Pacific Northwest

Despite its incredible culinary appeal, Brian initially became interested in wasabi for its potential health benefits. Brian, who until five years ago was a researcher and lecturer in botany at the University, came across some information about wasabi and its potentially anti-cancer properties right at a time when he had recently lost several family members to cancer.

In 1993, he ordered his first wasabi seeds from Japan and planted them. They died soon after, but a second batch sprouted and grew. Fast-forward to today – skipping past years of trial and error, endless experiments with growing conditions – now, the wasabi is top-notch. It’s now available year-round from farms in the Americas and can be shipped overnight.

Wasabia Japonica is native to Japan, where it has long been a coveted delicacy (and also known to have medicinal benefits – more on this below). Such was wasabi’s desirability that, according to one story, shoguns gave Samurai warriors wasabi plantations as a thank you for services performed.

In the wild, wasabi grows naturally in cold, mountain stream beds. Traditional Japanese farmers have also planted it in streams for cultivation, which produces great plants; semi-aquatic, or sawa wasabi, is considered more desirable for flavor and character than soil-grown. For Brian, however, in-stream was not a viable long-term planting option, considering the meandering route of streams, even controlled for planting. “It’s not very linear,” he points out – certainly not in the Western farming model of neat fields on acreage! Now, after years of research and experimentation, Brian and his associates have developed a method of growing sawa wasabi, with excellent results.

Wasabi is considered by many people to be a very difficult plant to grow. Brian agrees with this statement, however, “It’s like baking a difficult cake; once you figure out the recipe, it’s not so hard,” said Brian.

Perhaps not, but the recipe took many years to discover! Even now, they continue to experiment and tweak their methods.

The Health Benefits of Wasabi

In a published article of Naturopathy, Brian detailed some of the potential benefits of wasabi, some of which are summarized below.

– Wasabi is a member of the super-healthy cruciferous family, which includes kale, cabbage, broccoli, cauliflower, brussels sprouts, mustard and more.

– When ground up and mixed with water – that is, when chewed – a group of compounds in fresh wasabi convert to isothiocyanates (ITCs); much of the health-related research on wasabi has focused on the attributes of these ITCs. (They don’t occur in dried wasabi, but recent work is showing that freeze-drying preserves them until they are ingested.)

– In Japan, wasabi has long been believed to have medicinal properties. ITCs inhibit some strains of bacteria, yeast and mold; it is believed that wasabi’s antimicrobial effects are a reason that it became a part of the diet in Japan, an effective complement to any ill effects of raw fish.

– ITCs also have anti-inflammatory effects, meaning that wasabi may be useful for controlling seasonal allergies and asthma. Brian and his family are convinced that it is, and they love to tell stories of friends and family members helped greatly by wasabi (in freeze-dried capsule form). They have recently found a clinical trial done in Japan that supports the fact that wasabi is very good for seasonal allergies.

Other potential benefits are helping to prevent tooth decay and, possibly, working against cancer cells. Research has been limited, partly due to the low availability of wasabi and the expense in obtaining it. Brian hopes that, having learned to grow it, he will be able to help scientific research on wasabi progress.

– Fresh wasabi is occasionally available at some well-stocked Asian groceries.

Fresh Wasabi – The Whole Nine Yards

Plants: Wasabi is ready to harvest after at least 18 months, when the bushy, leafy plants are about knee-high. The whole plant is pulled up.

Wasabi Rhizome: The rhizome – a thick, root-like stem growing just above ground-level – is the coveted part of the plant. The knobby rhizome is about THREE to SIX inches long.

Leaves and Petioles: Virtually unknown in North America are the wasabi plant’s leaves. The palm-size leaves and long, crisp, light-green stems are both edible and delicious. They don’t taste quite like wasabi, but they have a bit of a spicy bite to them, and they make an excellent salad green.