If you have ever eaten ramen at a Japanese restaurant and noticed a fragrant red oil floating on top of the broth, you have probably tasted rayu (la-yu). This aromatic Japanese ramen chili oil is a staple condiment in ramen shops across Japan. Just a small spoonful adds warmth, aroma, and a gentle spicy kick that transforms a bowl of noodles.
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Making homemade rayu is surprisingly simple. By slowly infusing oil with garlic, ginger, and green onion, then pouring it over Japanese chili powder, you create a deeply flavorful ramen chili oil that tastes fresher and more fragrant than most store-bought versions.
Once you have a jar in the kitchen, you will find yourself reaching for it constantly. Drizzle it over ramen, stir it into dumpling dipping sauces, or add a spoonful to rice bowls when you want a little extra heat.
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What Is Rayu?
Rayu is a Japanese chili oil traditionally used as a condiment for ramen, dumplings, and noodle dishes.
The oil is infused with aromatics such as garlic, ginger, and green onion, then combined with Japanese chili powder. The result is a fragrant chili oil that adds warmth and aroma without overpowering the dish.
In ramen restaurants across Japan, rayu is often placed on the table so diners can add a spoonful of ramen chili oil to their bowl according to taste.
What Chili Oil Is Used in Ramen?
The chili oil most commonly used in ramen shops is rayu.
Unlike heavier chili oils, rayu is designed to complement the broth rather than dominate it. The combination of sesame oil, chili, and aromatics adds a gentle heat and a nutty aroma that pairs beautifully with ramen.
A small spoonful of this Japanese ramen chili oil stirred into broth can elevate the entire bowl.
Why Make Rayu at Home?
Homemade rayu has a brighter, fresher flavor than bottled versions.
Making it yourself also allows you to:
- Control the spice level
- Adjust the sesame oil aroma
- Avoid additives and preservatives
- Create a more fragrant chili oil
The process takes less than 30 minutes and produces a jar of Japanese chili oil that will last for months.
Equipment
You only need a few basic tools to make this recipe:
- Heavy-bottomed saucepan, wok, or skillet
- Heatproof jug or bowl
- Fine mesh sieve
- Glass jar or bottle for storage
Ingredients
- Neutral oil (such as sunflower, canola, or vegetable oil)
- Toasted sesame oil
- Garlic
- Fresh ginger
- Green onions (scallions/spring onions)
- Japanese ground red chili pepper (ichimi togarashi)
- Red chili flakes
How to Make Ramen Chili Oil
Prepare the aromatics:
Trim off the white root ends of the green onions so you are left with just the green tops. The greens give the oil a mild onion aroma without the sharper flavor and extra moisture found in the white parts.
Slice the ginger into roughly ½ cm slices. There is no need to peel it since the ginger is only used to infuse the oil with flavor and will be strained out later.
Peel the garlic clove and slice it in half. Larger pieces release their flavor more gradually into the oil and are less likely to burn. If your cloves are small, you can simply leave them whole.
2. Heat the oil
Pour the neutral oil and toasted sesame oil into a pan. A skillet works well, but a wok or heavy-bottomed saucepan will also work. Heat the oil to 160°C (320°F). The goal is to gently sizzle the aromatics rather than deep fry them.
3. Infuse the oil
Add the garlic, ginger, green onion tops, and crushed chili flakes. Allow them to gently sizzle for about 20 minutes, slowly infusing the oil with flavor. The aromatics should bubble gently rather than fry aggressively. This step builds the fragrant base that gives rayu its signature ramen chili oil aroma.
4. Prepare the chili mixture
Meanwhile, add the ichimi togarashi to a heatproof jug. Stir in about 2 teaspoons of water until evenly dispersed. The mixture should resemble wet sand.
5. Bloom the chili oil
Once the oil is ready, carefully strain it through a sieve into the jug over the chili mixture. Pour the oil while still hot so the chili powder blooms and releases its aroma.This creates the rich red color and deep flavor of Japanese chili oil.
6. Cool and store
Allow the homemade rayu to cool completely, then transfer it to a clean jar and seal with a lid. Congratulations, your rayu is ready to use. Because the aromatics have been strained out, it will keep well for up to 3 months in a cool, dry place.
How to use Rayu
Rayu is most commonly used as a finishing oil for ramen, but this fragrant Japanese chili oil works with many dishes. A small spoonful adds warmth, aroma, and gentle heat. Try it with:
- Ramen - drizzle a little rayu chili oil over a bowl of vegan miso ramen, yuzu ramen or shio ramen for that classic taste.
- Gyoza - mix rayu with soy sauce and rice vinegar for a classic dumpling dipping sauce. It pairs perfectly with these shiitake, vegetable and soy mince gyoza.
- Noodle bowls - splash a little rayu over these tofu noodles or yaki udon for a rich sesame spice kick.
- Rice bowls - add a spoonful of rayu to this shiitake and tofu donburi or vegan beef donburi for a fragrant chili heat that lifts the whole bowl.
How Long Does Rayu Last?
If strained and stored in a clean jar, homemade rayu will keep for about 2 to 3 months in a cool cupboard.
It can last even longer in the refrigerator. Always use a clean spoon when serving to keep the oil fresh.
Tips for the Best Rayu
- Keep the oil temperature gentle: The aromatics should slowly bubble rather than fry aggressively. This keeps the oil fragrant and prevents bitterness.
- Use good sesame oil: Toasted sesame oil gives rayu its distinctive nutty aroma.
- Strain the aromatics: Removing the garlic, ginger, and green onions helps extend the shelf life.
Homemade Rayu FAQs
Rayu is a type of chili oil made with sesame oil and Japanese aromatics. It tends to be lighter and more fragrant than many other chili oils.
Rayu usually has a moderate level of heat. The spice level depends on the amount of chili used.
Most ramen shops use rayu, a fragrant Japanese chili oil that adds heat and aroma to ramen broth.
Final Thoughts
Once you have a jar of homemade rayu in the fridge, you will start adding it to everything. A drizzle over ramen, a splash in dumpling dipping sauce, even a spoonful over a simple bowl of rice can instantly wake a dish up. It is one of those small kitchen staples that quietly transforms everyday meals into something proper tasty.
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📖 Recipe
Homemade Rayu (Japanese Ramen Chili Oil) Recipe
Equipment
- Heavy-bottomed saucepan skillet, or wok are great options
- Heatproof jug or bowl
- Fine mesh sieve or strainer
- Kitchen thermometer (optional but recommended)
- Glass jar or bottle for storage
Ingredients
- 250 ml neutral oil such as sunflower, canola, or vegetable oil
- 60 ml toasted sesame oil
- 1 large garlic clove halved
- 3 slices fresh ginger about ½ cm thick
- 4 Green tops green onions scallions
- 15 g Japanese ground red chili pepper ichimi togarashi
- 1 teaspoon crushed red chili flakes
Instructions cook mode
- Trim off the white root ends of the green onions so you are left with just the green tops. Peel the garlic and slice it in half lengthwise. Slice the ginger into roughly ½ cm slices.
- Pour the neutral oil and toasted sesame oil into a saucepan, skillet, or wok. Heat the oil to 160°C (320°F).
- Add the garlic, ginger, green onion tops, and crushed red chili flakes. Allow them to gently sizzle for about 20 minutes, infusing the oil with flavor. The aromatics should bubble gently rather than fry aggressively.
- Meanwhile, add the ichimi togarashi to a heatproof jug or bowl. Stir in about 1 teaspoon of water until evenly dispersed. The mixture should resemble wet sand.
- Carefully strain the hot oil through a fine sieve into the jug over the chili mixture. Pour while still hot so the chili powder blooms and releases its aroma.
- Allow the rayu to cool completely, then transfer it to a clean jar and seal with a lid. Store in a cool, dry place for up to 3 months.
Video
Notes
- Ichimi togarashi substitute: If you cannot find ichimi togarashi, crushed red pepper flakes make the best substitute. For a smoother chili oil, lightly grind them before using.
- Keep the oil gentle: The aromatics should slowly bubble rather than fry aggressively. This prevents the garlic from burning and keeps the oil fragrant rather than bitter.
- Strain the aromatics: Removing the garlic, ginger, and green onions helps keep the oil clear and extends the shelf life.
- Storage: Because the aromatics are strained out, the rayu will keep for up to 3 months in a cool, dry place. Always use a clean spoon when serving.
- Adjust the heat: Add a little more crushed chili flakes if you prefer a spicier chili oil.
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