How to Make Your Own Roasted Rice for Genmaicha

How to make your own roasted rice for genmaichaI love genmaicha.

The roasted rice adds a nutty flavor and aroma that combines perfectly with green tea. This tea is popular in Japan, where it has a long tradition.

Whenever I drink genmaicha, it brings back good memories of my life as a student in Japan.

I’ve always wondered if it was possible to roast my own rice so that I could blend it with green tea and make my own genmaicha. In this article I’ll share with you how to best go about making genmaicha at home.

Prior research

I first searched online for a recipe, but most of the information available was pretty lame.

The first mistake I noticed was that some people used brown rice. Genmai (玄米) does mean brown rice in Japanese, but in genmaicha the rice used is white roasted rice.

Sometimes people also refer to it as toasted rice. For the rest of this article I’ll just call it genmai as the Japanese do.

There are two types of rice that can be used: mochi rice and Japanese rice (uruchimai). Mochi rice yields a better genmai but since it’s expensive and harder to get, I’ll use Japanese rice. You can order it from amazon here (affiliate link) if it’s not available near you.

I also want to make genmai with methods available in the kitchen. When I looked at sites about how puffed rice was made (because it looks similar to genmai), I found that the process involves great pressure.

Other more traditional recipes called for the use of hot sand, or frying in oil. High pressure and hot sand don’t look safe to me so I discarded those. Frying in oil would ruin the taste of genmaicha, in my opinion, so I’ll refrain from doing that too.

I found brief descriptions in a couple of Japanese genmaicha companies saying that the process for genmai production involved soaking, steaming, drying and roasting. No temperatures, times or any other workable measurements are given.

Another discovery was a very thorough article by Dave Arnold about puffed snacks from the Cooking Issues blog: “Making puffs is as simple as: over-cook, dehydrate, and fry.”

Dave also states that the moisture content should be about 12%. The problem with that article is that he used a dehydrator, and he fries the snacks at the end. However, he says one can use also use an oven for drying and a microwave for puffing.

The experiment

I followed different recipes in order to test them:

  1. Only roasting the rice in a pan
  2. Soaking the rice before roasting
  3. Soaking, cooking and roasting
  4. Soaking, over-cooking, drying and roasting
  5. Soaking, over-cooking, drying and microwaving

1. Roasting the rice in a pan

Roasting rice in a panI saw various articles with this simple recipe. Whoever tells you that this is the method to make genmai probably never drank genmaicha before! The result doesn’t look like genmai at all and the rice is very hard, no puffing at all. Don’t even bother trying this method.



2. Soaking the rice before roasting

Soaked riceI soaked the rice for 2 hours. Notice how the rice grains become clear. This way they have some moisture to help them puff.

Next, I  roasted the soaked rice. If I used high heat (and this goes for all the recipes) the rice burns quickly. So I used medium heat for some time until it looked about right. This takes less than 5 minutes.

Soaked rice grainsBe careful because once the rice starts to turn brown it will burn easily. It happened to me 3 times! Burned genmai will taste awful, so don’t over-roast.

The texture looked better than in recipe 1 but it was still too hard.


Roasted soaked rice


3. Soaking, cooking and roasting

Cooked rice in panThis recipe involves steaming. After soaking the rice as in recipe 2 I also rinsed it until the water was clear, just like when cooking normal rice.

I decided to use a rice cooker and cook the rice using the standard measurement of water per cup of rice as indicated by my rice cooker.

Once it was done cooking, I didn’t open it for 15 minutes so that it steamed some more. Then I would let the rice cool, because while it’s still hot it releases too much moisture.

Roasted cooked riceFinally, I roasted it at medium heat. The result was softer than recipe 2 but it still doesn’t look as puffy as real genmai.

Flavorwise I guess it kind of passes, though. I suppose you could actually use this recipe if you aren’t too picky :-)


4,5. Soaking, over-cooking, drying and roasting/microwaving

Over cooked riceAccording to Dave, to ensure that the moisture content is right, one has to over-cook first. I did that by adding twice as much water to the rice cooker. The rice comes out super soft and sticky.

I allowed it to cool before placing it in a silicone baking sheet. Then I placed it in the oven at 135 °F (57 °C) for two hours, with the oven door a bit open.

Over cooked rice in baking sheetThe idea here is just to dry it, not cook or burn it.

After the 2 hours, turn off the oven and leave it to cool overnight. The next day I found that the rice had indeed dried, but not evenly :-( Perhaps because some rice grains were on top of each other?

Dried riceThe rice grains that looked good had a plastic, rubbery texture (unlike normal cooked rice which is soft) and the outside was a bit hard. I guess that they had the right moisture content, it’s hard to tell.

Many rice grains had stuck to each other. This was annoying because I had to manually separate them to continue the process!


Using a microwaveI then tried using the microwave. 2 minutes for a small amount of rice. If I had used more rice probably the time would be longer.

Since the rice wasn’t evenly dry, not all of them puffed. The ones that did had a good texture (small bumps similar to commercial genmai), the crunchiness was good but the color was a bit whitish.

Microwaved rice


Roasting the dried rice in a panThe batch that I roasted in a pan was probably the best of them all, although I still had the problem of the unevenly-dried rice. It’s not exactly like the genmai found in genmaicha but it’s pretty close.

Mine looked longer and had a slightly different color but the crunchiness and taste were not so far off.

Finished genmaiBy the way, in none of the methods above did the rice fully pop into what looks like popcorn. To me that was ok because I prefer just the genmai.




Home made vs commercial genmai

Homemade vs commercial genmai

Homemade genmaichaFinally I mixed my homemade genmai with loose sencha leaves and my genmaicha was completed! I guess I can’t really compare it in a fair way because I used tea leaves from a high-quality sencha. I tried it and it was great!

I also made enough to give away as gifts ;-) The added value of having roasted your own genmai is definitely worth it, although the process probably needs some more adjustments.

I encourage you to try making your own roasted rice. Please write about it in the comments to share your experience.

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23 Responses to How to Make Your Own Roasted Rice for Genmaicha

  1. The ultimate home made tea project! I just acquired some Sencha Maroyaka that won at the 2012 North American Tea Championship and I have some rice that I recently brought back from Tokyo so I’m off to my kitchen to give your recipe a go. I may fiddle around with adding some Matcha as well. I agree that using deep fried rice in Genmaicha would be a bad idea. Wouldn’t that leave the tea with an oil slick on top and an undesirable mouth feel? Your method sounds right to me.

    • Thanks for the comment, Jennifer. Best of luck with your cooking. I advise you to roast in small batches, because that is the most delicate part and it takes some tries before you get the hang of it. Also use the pan instead of the microwave, because it’s easier to keep an eye on.

  2. Kyle Winter says:

    Gotta love a good tea experiment. This is something I’ve always wondered about, so thanks for covering this topic. I’ll have to try this soon. You seem to be big on Japanese tea so I don’t know if you drink much Chinese tea, but I’ve been working on an experiment in making my own shu pu’er, so we’ll see how that turns out.

    • Hello Kyle.
      Thank you for your comment. I don’t drink much Chinese tea but when I do it’s usually oolong or pu-erh. Good luck with your experiment, remember that it usually takes some failures before you get it right.

  3. Nadda says:

    Hey there, I think you are pretty much the only person online who suggested using white rice. I did not have mochi rice or Japanese rice so I ended up using jasmine rice. I washed it first then I toasted it in a pan. the tea came out pretty well and similar to that of my favorite tea at my local Japanese restaurant. I think I ought to try using mochi rice next time though. Thanks!

    • Hello Nadda, thanks for the comment. I used white rice because that’s what I read in Japanese websites, apparently the brown rice doesn’t turn out as well because of its hard outer shell.
      I’m glad the jasmine rice worked out for you : )

  4. This is really interesting Ricardo! Thanks for experimenting – you’ve done the work and now we can use your best result! I wonder if the popped rice grains are done from raw grains similar to popcorn. I’m going to try popping them in my dry popper and see what happens.

    • I’m glad you liked the article, Linda.
      You can pop raw rice grains by using enough pressure, but that requires machinery not available for kitchens.
      The reason popcorn pops easily is because it has enough moisture inside. Since rice grains don’t, we have to cook them first.

  5. I_Fortuna says:

    Did you try dry roasting the rice first, then over cooking with double the water then drying? If you dry roast first, the kernals will not be very sticky when you go to roast it in the oven even if it is over cooked. I make my rice this way all the time and it is always fluffy regardless of the kind of rice I use. When I dry roast the rice, the kernals pop a little and with moisture they should expand more fully for oven roasting. You may not even have to double the water if you use this method. I think the higher heat cause the kernals to pop just like popping corn.

  6. Elan says:

    I always thought the popped pieces in genmaicha were popped rice pieces, but it’s actually popped sorghum seed.

    • Traditionally, it is popped rice. However, now you can have popped sorghum and millet, perhaps because they have a lower price?

      I looked at Japanese genmaicha ingredients and in some cases it is as you say, thanks for pointing that up. For example, look at this page:
      It’s in Japanese, but is says prices for different types of genmai. The “hana”, which is the popped component, is twice as expensive when made with mochi rice, instead of millet.

  7. BUDI says:

    maybe you can drying cocked rice on refrigerator.
    i’thing is the best way to drying food without heat material.

    i live in rice country, when i have rice leftover, i store in refrigerator, if i forget to eat in couple day its dry like crunchy snack and no sticky.

    maybe you can try it.

  8. Chuck Bauman says:

    I just returned from a week-long trip to Japan, where we met with several tea growers and blenders/finishers (seicha). During one of our meetings, for what it’s worth, they noted that American rice is sometimes (often?) used because it is cheaper than Japanese rice. Unfortunately, I did not think to inquire more deeply about how the rice is made……

    • Hi Chuck
      Thank you for your comment.
      What an interesting trip, I’m jealous : )
      I didn’t know that sometimes American rice is used, but it doesn’t surprise me. As you pointed out, Japanese rice is expensive, even for the average Japanese consumer!

  9. Tyler says:

    When you did the roasting-only method, did you wash it first (at leat 3 times) so the rice was a little damp? Because this is what I do, and it comes out fabulously. It pops into popcorn and everything!

    • Hello Tyler

      As you can see on experiment #2, I soaked it for 2 hours. However, it was still too hard compared to commercial genmai, and tended to burn easily instead of popping.

  10. Craig says:

    Would a pressure cooker add something to the process?

  11. jacob luke says:

    What about using mochi rice cakes? It is popped rice…

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