Umeboshi are a traditional Japanese food made from dried and preserved plums. They have a signature sour taste with a subtle touch of semi-salty sweetness. Umeboshi are typically used as a filling for onigiri rice balls or bento boxes but have other uses too. Read on to discover how to make your own umeboshi at home from scratch and enjoy this unique Japanese food.
What Is Umeboshi?
Umeboshi is a traditional Japanese preserved plum. “Ume” is the Japanese word for plum fruit and “boshi” means dry. It is a traditional and popular preserved food made by pickling green and firm plums (Ao-ume) with salt then drying in the sun. It is often dyed red using purple Shiso perilla leaves. Umeboshi has been consumed historically for medicinal purposes and has often been used as a portable food in emergencies. Umeboshi taste is salty and sour because of citric acid.
What Is Umeboshi Good For?
Apart from having a special taste, it has health benefits. The sourness of Umeboshi is due to the citric acid and Malic acid. Citric acid, which is contained in lemons and other citric fruits, promotes gastrointestinal function, promotes appetite, and improves protein digestion. Malic acid is effective in relieving fatigue. By taking both acids together it is meant to be effective for healing inflammation and promotes good gastrointestinal function.
There are a few flavor varieties in Umeboshi: Shiroboshi, Akajiso (red shiso) Zuke, Katsuo-ume, Hachimitsu-zuke, Konbu-ume, Ringo-ume, Karikari-ume etc. Shiroboshi is Ume plum pickled with salt without red shiso and Akajiso zuke is with red shiso. Katsuo-ume is what I grew up eating and is made with bonito flakes. Konbu-ume is made with kelp, Ringo-ume uses apple cider vinegar and apple juice, and Karikari-ume is made using smaller ume plums which have a crisper crunchy flesh.
Umeboshi can be eaten as it is and has a variety of other uses. The liquid that is made when ume is salted is called plum vinegar which can be used as a type of vinegar for foods such as sushi and mixed with mirin to make salad dressings. By straining and crushing the umeboshi into a paste and combining it with sugar, mirin, and soy sauce can make “umeniku ae”, which can be added to salads to create more flavor. Adding umeboshi to dishes using simmered blue-backed fish (such as sardines and mackerel) can add more flavour and improve the taste.
It is also used as a preservative in foods such as bento lunch and as Onigiri rice balls filling because Umeboshi has a high acidity level. Umeboshi can also be used to make soup by cooking it with shredded ginger and soy sauce. The purple shiso leaves that can be added when making the umeboshi can later be used to make yukari shiso furikake.
Where to Buy Umeboshi?
Umeboshi can be purchased from local Japanese grocery stores and online. However, it’s much more rewarding to make at home and is not a difficult process. The only thing you may find tricky is finding ume plums. I was lucky and found ume plums one day at my local Japanese grocery store so you may want to try searching around at Asian grocery stores near you. You can also try finding them at local Asian markets that may occur in your city on the weekends. If you want fresh ume plums then try searching around June as this is when they are in season.
What Equipment Do I Need?
A container for pickling – avoid acid-sensitive plastic and metal containers. Choose enamel, glass or pottery containers. I used a glass jar that I bought from Ikea, which cost me like A$5. Weight – A weight is needed to apply pressure on the top of the plums. You need the same weight as the Plums. So if you have 1kg of plums, you need 1kg of weight. I had 350g of plum, so I placed 350g of baking beads into a ziplock sandwich bag and used it as the weight. A bamboo tray – to dry the pickled umeboshi and red shiso in the sun.
What Ingredients Do I Need?
There are many types of Ume Plum fruits available in Japan. I would pick Nankō Ume, which are mainly produced in Minabe, Wakayama prefecture where I grew up. However, outside of Japan, if you can find any fresh Ume plum consider yourself lucky. You would probably not have the luxury of choosing a specific type.
Japanese use Ume plums to make Umeshu (Plum wine), Ume syrup, Ume jam, and Umeboshi etc. Green firm Ume, which is called Ao-ume is good for making Umeshu and syrup. The ripe and yellowish plum are best suited for making umeboshi. If you have a chance to get fresh Ume plums and if it is still green and firm, leave them in room temperature till they turn yellowish in colour.
Traditionally, we need salt 18% to 20% of the weight of the plums. Reducing the salt makes it easier for mould to grow. I followed the traditional way like my grandmother used to make, sticking to 20% salt. I recommend using larger grain salt which melts slowly so that makes the umeboshi taste mellow. reference: Plum Trivia by Kishū Ume Honpo
If you would like to make pinkish coloured umeboshi, you can add red shiso to colour the umeboshi. It is an optional step so if you can not get red shiso, you can skip this ingredient and extra steps for adding salted red shiso. Red Shiso can be found at the local farmers market or grow them as I do.
Flow of Making Umeboshi
- Make salted plums (it takes about 1 week to get Umezu, the liquid produced by pickling ume plum fruit with 20% of salt)
- Add red shiso to colour the salted plums (approximately 2 weeks)
- Sundry salted plums for three days which is called “Doyōboshi” in Japanese.
- Putting them back into the preserve container to mature. *you can eat it straight away but if you let it mature for 3 months or longer it will taste mellower. Also, you can preserve without putting them back into the umezu. In that case, the ume fruit will be dull orange in colour and will be viscous texture.
Tips to Make Umeboshi Without Fail
- Use ripe ume fruit – If you get green firm Ume fruit like I got, let them sit in the room temperature covered with newspaper till the colour turns yellowish.
- Disinfect with Shochu – though Shochu is quite expensive so I used Japaneses gin which contains 43% alcohol. You can use any 35% alcohol liquor.
- Use a minimum 18% of salt to ume plum fruit weight. Umeboshi is made with 20% salt traditionally and I usually follow that tradition. Reducing the salt amount results in making an environment that will easily grow mold and difficult to rise umezu (plum vinegar). Following this amount of salt also lets you enjoy your homemade Umeboshi for years.
How To De-salt The Umeboshi
You may be concerned about the amount of salt used to make Umeboshi. Don’t worry there is a way to de-salt it. Prepare 1L of water for about 10 umeboshi plums. Add a pinch of salt into the water and stir. Then Add 10 umeboshi plums and leave it for about 12 hours. By adding a pinch of salt, it makes it easier to remove the salt due to osmotic pressure. Drain the water well and store them in the refrigerator and eat them as soon as possible. Because using this technique the salt content is reduced to around 12-15%. Remember the lower the salt content, the shorter the shelf life. Reference: Kawashimaya how to desalt
Japanese traditionally pick 3-4 days from the dog days of the summer after the rainy season is over. Sun-drying pickled ume plum in those hot days is called “Doyoboshi” in Japanese. Because it is said that the dog days of the summer is the ideal time to sundry pickled ume plums.
Day 1: Sundry pickled ume plums and red shiso leaves during the day time only. Turn the plums and red shiso leaves sometimes so that they are exposed to the sun from every angle. When the sun sets, set them indoors and put them back into the umezu (plum vinegar). Day 2: Repeat same as day 1 but leave them outside overnight. Day 3: Same as Day 2. As a guide, the weight of umeboshi should be about 50-60% of the original.
A: Not necessarily. If you are using ripe yellowish plums, soaking in water actually makes the plums go off easily. If you are using green fruit, you could soak in water for a few hours.
A: After, because then we can avoid the water getting into where the calyx is removed.
A: By exposing it to the strong summer sun, it suppresses the growth of mold and also the moisture of the pickled plums are reduced which make a more condensed taste and flavour.
A: You can use them for making another pickles called “Shibazuke” and also you can make Yukari furikake rice seasoning from leftover shiso leaves. I am planning to have the Yukari recipe on the blog soon.
A: No it is not, the high salt content will kill any microorganisms to ferment.
Recipe Measurement Notes
- To alter the serving size click on the serving number and move the slider left or right to adjust the quantity.
- As you move the slider the quantities of the ingredients will adjust accordingly in both imperial and metric measurements.
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Umeboshi pickled plum
A traditional Japanese pickled plum “Umeboshi” recipe with step by step photo instructions, information, tips not to fail and more
a preserving jar
a ziplock bag
a bamboo tray
Momi Shiso (massaged red shiso leaves) for colour
Pickled Ume Plum
Sterilysing the preserving container by boiling in a large pot. Take them out and let it dry to set aside.
Wash Ume Plum fruits. *1
Pat dry the ume plum fruits with kitchen towel or cloths.
Place the ume plum in a ziplock bag and pour over the gin to disinfect.
Place some of the ume at the bottom of the sterilised preserving glass jar and add some of the salt. Repeat this to make layers of umeboshi and salt until the umeboshi is all used.
Place a weight on top of the last layer. I used baking beads inside a ziplock bag as a weight.
Store out of sunlight for a week. Check everyday if umezu (plum vinegar) is being produced and rising.
After one week, prepare the red shiso leaves to add to the plums.
After adding the leaves, set aside for 2 weeks.
Pick 3 consecutive sunny days to dry the umeboshi.
On day one remove the umeboshi from the jar and place onto a bamboo tray to dry. Make sure to leave a gap so they aren’t touching. Squeeze the liquid out of the shiso leaves and spread the leaves out on the tray to dry too. Bring in the tray at night and place the leaves and the plums back into the jar with the liquid.
On day two repeat the same as day one. However, do not put the plums and leaves back into the jar. Leave them on the tray.
On day three repeat the same as day two. *3
Momi Shiso (massaged red shiso leaves) for colour
Wash the shiso leaves and drain the water as much as you can.
Sprinkle half of the salt amount on top of the leaves.
Toss the salt and shiso leaves together then massage the leaves with your hands.
Discard the dark purple liquid that comes out.
Sprinkle the remaining half of the salt over the shiso leaves and massage again. *2
Squeeze out the dark purple liquid from the leaves.
Place the shiso leaves into a small mixing bowl.
Add 1 tbsp of umezu (plum vinegar) from the jar of plums.
Add the leaves to the jar of umeboshi and leave for another 2 weeks.
*2 This step removes the astringent taste from the red shiso leaves.
*3 After 3 days of sun drying, place the umeboshi in a clean preserving jar and store them in a cool and dark place. You can eat them straight away, though it you let it mature for three month or longer, the taste will become mellower.
Calories: 161kcal | Carbohydrates: 40g | Protein: 2g | Fat: 1g | Saturated Fat: 1g | Sodium: 27131mg | Potassium: 550mg | Fiber: 5g | Sugar: 35g | Vitamin A: 1208IU | Vitamin C: 33mg | Calcium: 38mg | Iron: 1mg
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