by Talley

in Methods,Science

Horseradish is one of those flavors that evokes a strongly polar emotional response in people. There is nothing mild or subtle about it: it’s abrasive, and you either love that or you don’t.


Given how easy it is to prepare horseradish, it surprises me that those who do love it rarely prepare their own. This is evidenced in part by the fact that the checker at my local grocery rang up my horseradish root yesterday as jicama. Apparently horseradish (and I guess jicama) doesn’t sell too frequently. Most people are happy to squeeze their own fresh lemon juice when they need it, or mince up some ginger for a stir fry. But when it comes to horseradish, most reach for that jar of runny and mild pre-prepared stuff rather than grating or processing some fresh. I’m here to implore you to stop. Just get yourself some horseradish root, peel it, chop it into thick coins, wrap it up good and freeze it. Now you’ve got some nose jarring goodness any time you need it just a few minutes away. If you’re interested, read on for more on the background and science of horseradish. Or you can skip the science mumbo-jumbo and jump to the end to read more about preparing your own.

Chopped Horseradish

The science…

Horseradish (amoracia rusticana) is a root vegetable in the cabbage family. It’s native to western Asia and southeast Europe, though it now grows quite aggressively in many parts of the world. It was prized in Greek mythology for its medicinal and culinary purposes. It’s been used as a pain reliever, a cough remedy, and (surprisingly) an aphrodisiac. In the Passover Seder it is used to symbolize the bitterness of Jewish slavery in Egypt.

Intact, horseradish barely has an aroma. But when the plant cells are damaged during grating or processing, the enzyme myrosinase is released which catalyzes the degradation of a compound in the horseradish known as sinigrin into allyl isothiocyanate, also known as mustard oil. Therefore the pungency of your preparation will depend directly on how finely you grate it and how many cells you damage in the process. Think of it as a fantastic little mustard oil producing factory, ready to pump out a bunch of mustard oil on command. Or think of it like the chemical reaction that happens when you crack a glow stick, allowing the two stockpiles of chemicals inside to intermingle and create a glowing product. Evolutionarily, this adaptation of a noxious product created upon cellular damage probably served to deter potential predators from eating the plant. It is a defense found in many brassicas, including cabbages, kales, and infamously, wasabi and mustards. It is especially active in young, actively growing tissue.

The acidity of vinegar halts the enzymatic activity of myrosinase and preserves whatever flavor compounds have been produced up until that point. So, if you wait a few minutes before adding vinegar to your grated horseradish, you will allow the pungency to develop stronger. If you prefer a milder preparation, add the vinegar sooner after processing.

Mustard oil is also responsible for the pungency of mustard and wasabi. It is quite volatile (easily vaporizes) at room temperature, which explains why these flavors hit us so strongly in the nose (unlike, say, the heat of a chili pepper which must be heated to above 140˚F or so to become volatile and get you coughing and sneezing). Incidentally, given this tendency to vaporize, if you ever get an overly strong bite of horseradish or wasabi and experience that sinus-ripping pain, you should breathe out through your mouth (so as to prevent sending the vapor into your nose) and in through your noise (so as to prevent excessive inhalation of the compound). If you’re interested in food science, be sure check out Howard McGee’s definitive book On Food and Cooking: The Science and Lore of the Kitchen. Now, back to the practical!

Prepared Horseradish

Although it will keep just fine in the refrigerator for a few weeks, I prefer to make up just enough horseradish to use in whatever dish I’m about to prepare on that day. It doesn’t take long, so unless you are using it quite frequently, I see no reason to prepare much more than you will use immediately. Prepared horseradish will lose it’s flavor with time. The following makes about 2 tablespoons, adjust as necessary

  • 1 large coin of horseradish, about ½-inch thick (about ¾-1 oz.)
  • about 1 tsp white vinegar
  • pinch of salt

Peel the skin off of the horseradish root using a vegetable peeler or a paring knife. Trim any browned bits and chop the root into small pieces.

Put into a food processor and process until well ground. Use a small amount of water to facilitate the chopping if necessary (but sometimes the water just makes it stick to the sides). Remember: the finer you process the horseradish, the more pungent it will be. If you don’t have a food processor, use a grater to finely process the root. Be careful! This stuff is much more potent than onions and will burn your eyes and your nose if you get too close.

Add a small amount of vinegar (maybe about ½ to 1 teaspoon) and a small pinch of salt to stabilize. Again, if you wait a few minutes to add the vinegar, it will develop more pungency.

Store covered in the refrigerator until use.

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Tokyo Terrace October 12, 2009 at 12:17 pm

I think wasabi is in the same boat (or “house boat” if you will) as horse radish. Even in Japan the fresh root is not as popular as the kind found in a tube. Great post and great photos, as always!


Connie October 13, 2009 at 12:21 am

I love fresh horseradish. I remember having to grind up large amounts of it for potato purée at a restaurant, it always brought tears to my eyes. But the effort (and pain) was worth it, the stuff that comes in jars is deplorable. Nice scientific explanation by the way, lots of good info!


Donna October 13, 2009 at 12:58 pm

Thanks for the science lesson – I'm going to dig some up tonight, process it, wait awhile, add vinegar and wait for my head to light up! Great info, thanks!


KennyT October 14, 2009 at 12:24 am

Very informative, thanks!!


loretta October 25, 2009 at 10:14 am

Just wondering, do you plant horseradish? If so where do you buy the plant to get started. Thanks


Beryl October 26, 2009 at 10:47 pm

Hi Loretta,
I haven’t planted horseradish, partly because it tends to be a really aggressive plant and I haven’t wanted to open that can of worms. You can get it through Territorial Seed. Just read up on how to keep it contained before planting!


zested November 13, 2009 at 10:42 am

Love the reflections in this shot. Did you bounce a light from above to get that effect? On a side note, the pile of the white chopped root looks vaguely illicit!


Talley November 13, 2009 at 11:02 am

Illicit? haha. For the reflections, we just placed the roots on a piece of black marble tile. No light bouncing though, the picture was taken outside with a black felt backdrop to merge the background with the marble, and the natural light bouncing off the roots onto the marble caused the reflection. Definitely a fun effect…


beryl November 13, 2009 at 12:06 pm

Ha! Totally illicit! Didn’t I try to tell you that? May be a bit of a Freudian slip…


shasta December 13, 2009 at 6:07 pm

In the early spring, when the horseradish is just starting to come back from its long winter sleep, the tiny, new leaves are wonderful in salads. They’re young and tender, with a nice horseradish bite to them. very flavorful. Once they get very big and start losing that chartreuse green, they lose their tenderness and flavor. Try it! You’ll like it!


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