裏ごしする

The Japanese verb 裏ごしする (uragoshi suru) is a specialized culinary term that refers to the process of pressing or straining food through a fine-mesh sieve or strainer to achieve a smooth, uniform texture. While the English word 'strain' often implies removing liquid from solids, uragoshi specifically focuses on the transformation of solid ingredients—like boiled potatoes, pumpkins, or beans—into a delicate puree by forcing them through the mesh. This technique is fundamental in both traditional Japanese cuisine (Washoku) and Western-style cooking in Japan (Yōshoku). The term is composed of 'ura' (back/reverse) and 'koshi' (straining), suggesting the action of pushing material through to the other side of a screen. In a professional Japanese kitchen, this step is never skipped when making high-end sweets or silky soups, as the texture is considered just as important as the flavor itself.

Core Action

The physical act of using a spatula or ladle to force cooked ingredients through a fine metal or horsehair mesh.

When you hear a chef say 'uragoshi shite kudasai,' they are asking for a level of refinement that goes beyond simple mashing. A potato masher leaves small chunks; uragoshi removes every single one of them. This is why the word is frequently associated with words like 滑らか (nameraka) meaning 'smooth' or 'silky.' It is used most often in recipes for kuri-kinton (sweet chestnut paste), pumpkin soup, or creamy desserts like blancmange. Beyond the kitchen, the word is rarely used metaphorically, making it a very stable, technical term for learners to master. It signifies a transition from 'home cooking' to 'delicate preparation.'

Historically, the tools for uragoshi were made from horsehair stretched over a wooden frame, known as a 裏ごし器 (uragoshiki). Today, stainless steel mesh is more common, but the verb remains the same. The process is labor-intensive, which is why it often appears in contexts describing 'careful' or 'high-quality' preparation. If you visit a traditional Japanese confectionery shop, the smooth bean paste (koshian) in your mochi is the result of rigorous uragoshi. In modern contexts, it is also a staple verb in baby food preparation manuals, where ensuring no large chunks remain is vital for safety and digestion.

Preparation Context

Used primarily when ingredients are soft/boiled and need to be homogenized.

In summary, uragoshi suru is the gateway to professional-looking Japanese food. It is more than just 'filtering'; it is a tactile, transformative process that elevates simple ingredients into something elegant. Whether you are making a delicate egg custard (chawanmushi) or a rich sweet potato tart, this verb describes the essential step of ensuring absolute smoothness. It is a 'suru' verb, meaning it is flexible in its conjugation, and while it is technical, it is an essential part of the vocabulary for anyone interested in the culinary arts or the precision of Japanese culture.

Using 裏ごしする (uragoshi suru) in a sentence follows the standard transitive verb pattern in Japanese: [Object] + を + 裏ごしする. Because the action requires a physical tool, it is often paired with the particle で (de) to indicate the instrument used, such as 網 (ami - mesh) or 裏ごし器 (uragoshiki - sieve). For example, 'I strain the potatoes with a sieve' becomes 'じゃがいもを裏ごし器で裏ごしする.' It is a functional word, so it appears frequently in the imperative form in recipes, such as 裏ごししてください (Please strain it) or the more casual 裏ごしして (Strain it).

Sentence Structure

[Noun] + を + [Tool] + で + 裏ごしする (To strain [Noun] with [Tool]).

The verb can also be used in the passive voice when describing the state of an ingredient: 裏ごしされた (uragoshi sareta - has been strained). This is common on food packaging or menus to emphasize the quality of the product, such as '裏ごしされたサツマイモ' (Strained sweet potatoes). Furthermore, it can be combined with adverbs that describe the degree of effort. 二度 (nido - twice) is a common pairing, as in '二度裏ごしすることで、より滑らかになります' (By straining it twice, it becomes even smoother). This highlights the repetitive and meticulous nature of the task.

In more advanced grammatical structures, you might see uragoshi used as a noun followed by the particle の (no) to describe a process. For example, 裏ごしの手間 (uragoshi no tema) refers to the 'effort of straining.' This is often used when people complain about how difficult a recipe is: '裏ごしの手間を惜しまないことが、美味しさの秘訣です' (Not begrudging the effort of straining is the secret to deliciousness). Here, the word takes on a nuance of 'extra care' or 'attention to detail.' Learners should also be aware of the potential for the word to be shortened to just 裏ごし in casual kitchen conversation, but the full suru form is the standard.

Finally, consider the result of the action. Sentences often end with the purpose of the straining, using structures like 〜ために (tame ni - in order to). 'ダマ（塊）をなくすために裏ごしする' (To strain in order to get rid of lumps). This explains the 'why' behind the 'what.' Whether you are reading a cookbook, watching a Japanese YouTube cooking channel, or helping out in a kitchen, these patterns will be the most frequent ways you encounter the word. Practice by replacing the object with different foods: eggs (tamago), beans (mame), or fruit (furuutsu).

You will most commonly encounter 裏ごしする (uragoshi suru) in instructional environments related to cooking. This includes TV cooking shows, YouTube recipe videos, and culinary school textbooks. In these contexts, the word is used with authority and precision. A host might say, 'ここで一度、裏ごししましょう' (Let's strain it once here) to signal a crucial step in the preparation. Because Japanese culture highly values the 'mouthfeel' (kuchiatari) of food, this word carries a weight of quality. If a restaurant menu mentions that their chestnut puree is 'teinei ni uragoshi sareta' (carefully strained), it is a selling point that justifies a higher price.

Media Contexts

Recipe blogs (Cookpad), cooking variety shows (NHK Kyou no Ryouri), and baby care magazines.

Another very common place to hear this word is in the context of 離乳食 (rinyuushoku - baby food). New parents in Japan are often instructed by pediatricians or health workers on how to uragoshi vegetables to make them safe and easy for infants to swallow. In this setting, the word is associated with care, safety, and health. You might hear it at a local health center during a parenting seminar. The tone here is supportive and instructional. It’s one of those 'life stage' words that many Japanese people become very familiar with once they have children, even if they weren't avid cooks before.

In professional kitchens, the word is part of the daily jargon. A head chef (itamae) might bark the order to a junior apprentice. Here, the word is used quickly and efficiently. Outside of the kitchen, you might hear it in a more metaphorical or descriptive sense in food reviews or gourmet documentaries. A narrator describing the process of making traditional 'Wagashi' (Japanese sweets) will use uragoshi suru to emphasize the craftsmanship involved. The sound of the word—'ura-goshi'—has a rhythmic, almost satisfying quality that reflects the repetitive motion of the task itself.

Finally, you might encounter it in supermarkets, specifically in the frozen or canned food sections. Products like 'Uragoshi Tomato' (Strained/Pureed Tomatoes) or 'Uragoshi Corn' are common staples. In this case, the word acts as a descriptor of the product's form. Hearing or seeing this word instantly tells a Japanese consumer that the product is smooth and ready to be used in a soup or sauce without further processing. It’s a word that bridges the gap between the raw ingredient and the refined final product, making it a key term for navigating Japanese food culture.

One of the most frequent mistakes learners make is confusing 裏ごしする (uragoshi suru) with the more general verb 濾す (kosu). While both mean 'to strain' or 'to filter,' kosu is a broad term used for liquids (like tea or coffee) or filtering out impurities. Uragoshi suru is specifically for solid foods that are being mashed through a mesh to change their texture. If you say you are going to 'uragoshi' your coffee, it will sound very strange to a native speaker, as coffee is a liquid being filtered, not a solid being pureed. Use kosu for liquids and uragoshi for pastes and solids.

Mistake #1: Generalization

Using 'uragoshi' for liquid filtration (e.g., tea or water) instead of solids/pastes.

Another common error is confusing it with 振る (furu), which means 'to sift.' Sifting is the process of passing dry powders like flour or cocoa through a sieve to aerate them and remove clumps. While the tool (a sieve) might be the same, the action and the ingredient state are different. You furu flour, but you uragoshi boiled sweet potatoes. Mixing these up in a recipe could lead to confusion about whether the ingredient should be wet or dry. Remember: furu is for dry/powder, uragoshi is for soft/wet solids.

Learners also sometimes struggle with the 'suru' aspect of the verb. Because uragoshi is a noun, some might try to use it with other verbs like tsukaru or yaru, but suru is the only natural choice for the action. Additionally, ensure you don't confuse it with 水気を切る (mizuke o kiru), which means to drain water (like draining pasta). Uragoshi is a much more forceful and transformative process than simply letting water fall through a colander. If the goal is just to remove water, mizuke o kiru or zaru ni ageru are the correct terms.

Lastly, watch out for the pronunciation. Some learners misread the kanji 裏 (ura) as omote (front) or confuse it with other similar-looking kanji. It is always 'ura' in this context. Mispronouncing it might make it sound like a different technical term. In writing, ensure you include the 'go' (ご) which is the voiced version of 'ko' (こ) from the verb 'kosu.' This 'rendaku' (sequential voicing) is essential for the word to sound natural. Saying 'urakoshi' instead of 'uragoshi' is a minor but noticeable mistake for native speakers.

When looking for alternatives to 裏ごしする (uragoshi suru), it's important to understand the specific nuance of each term. The most common related word is 濾す (kosu). As mentioned previously, kosu is the broad category for straining. It is often used for liquids like dashi stock or tea. While you uragoshi a pumpkin to make a puree, you kosu the dashi to remove the bonito flakes. Kosu is less labor-intensive and focuses on separation, whereas uragoshi focuses on texture refinement.

Comparison: 裏ごしする vs. 濾す

裏ごしする: Forcing solids through mesh for smoothness (e.g., potatoes).
濾す: Filtering liquids to remove particles (e.g., tea leaves).

Another similar word is すりつぶす (suritsubusu), which means 'to mash' or 'to grind down.' This is usually done with a mortar and pestle (suribachi and surikogi). While suritsubusu also creates a paste, it doesn't necessarily involve a sieve, so the result might still have some fibers or small pieces. Uragoshi suru is the step you take after mashing if you want the result to be perfectly silky. In modern kitchens, many people use a ミキサー (mikisā - blender) or フードプロセッサー (fūdo purosessā - food processor). While these tools are faster, a purist would argue that they don't achieve the same delicate texture as manual uragoshi.

For dry ingredients, the word is ふるう (furuu), meaning 'to sift.' This is strictly for powders like flour or sugar. If you see 'sift' in an English recipe for flour, use furuu. If you see 'pass through a sieve' for a cooked vegetable, use uragoshi suru. There is also the term 漉し器を通す (koshiki o tōsu), which literally means 'to pass through a strainer.' This is a more formal or descriptive way of saying the same thing, often used in professional manuals. It sounds slightly more technical than the common uragoshi suru.

Lastly, in casual conversation, you might hear people use the English loanword ピューレにする (pyūre ni suru), meaning 'to puree.' This is a broad term that covers both blending and straining. However, uragoshi suru remains the most precise term for the specific manual action of using a sieve. Knowing these distinctions allows you to choose the right word for the specific culinary task at hand, showing a deeper understanding of Japanese cooking techniques.