Creamy Mentaiko Spaghetti: Two Ways

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Discover the ultimate umami-packed Japanese comfort food. This guide covers a rich, creamy version and a refreshing Shiso-infused take on classic Mentaiko pasta.

↓ The ingredients ↓ The steps

Mentaiko spaghetti is a beloved staple of wafu-pasta, the delightful marriage of Italian technique and Japanese flavors. By using spicy, umami-rich cod roe, you create a sauce that is both luxurious and surprisingly easy to prepare. Whether you prefer the velvety indulgence of heavy cream or the bright, aromatic bite of fresh shiso leaves, these two methods showcase the versatility of this iconic Japanese dish.

A bowl of Mentaiko spaghetti topped with shredded shiso leaves and nori strips.
A bowl of Mentaiko spaghetti topped with shredded shiso leaves and nori strips.
Prep10 mins
Cook15 mins
Total25 mins
Yield1 serving
DifficultyEasy
Calories550 kcal

Ingredients

Instructions

  1. 1Extract the Mentaiko roe
    Hands holding a Mentaiko sac and using a knife to scrape out the pink roe on a cutting board.

    Place the Mentaiko on a cutting board. Carefully slice open the outer membrane and use the back of your knife to gently scrape all the roe out of the sac.

    Tip: Be careful not to press too hard when scraping, so you dont tear the membrane and mix bits of it into your smooth roe.
  2. 2Combine with mayonnaise
    Squeezing creamy Japanese mayonnaise from a bottle onto bright pink Mentaiko roe inside a metal mixing bowl.

    Transfer the prepared Mentaiko roe into a mixing bowl. Squeeze in an appropriate amount of Japanese mayonnaise and mix them thoroughly to create a creamy paste.

    Tip: Japanese mayonnaise is richer and slightly sweeter than standard mayonnaise, which perfectly balances the salty, umami flavor of the Mentaiko.
  3. 3Boil the spaghetti
    Dry spaghetti being lowered into a pot of rolling boiling water.

    Bring a large pot of salted water to a boil. Carefully add the dry spaghetti strands into the water and cook according to the package instructions until al dente.

    Tip: Ensure the water is well-salted to season the pasta from within.
  4. 4Prepare the cream base
    Pouring thick heavy cream into a stainless steel pan to form the base of the pasta sauce.

    In a large, dry pan over medium heat, add the butter and heavy cream. Let them heat gently until the butter is fully melted and integrated with the cream.

    Tip: Keep the heat moderate to prevent the heavy cream from boiling over or separating before the pasta is added.
  5. 5Coat the pasta
    Using metal tongs to lift and toss cooked spaghetti in a bubbling creamy butter sauce inside a pan.

    Once the spaghetti is cooked al dente, transfer it directly into the pan with the cream sauce. Toss the noodles well so they absorb the rich, buttery liquid.

    Tip: Transferring the pasta directly from the pot brings a little starchy pasta water with it, which helps emulsify and thicken the sauce beautifully.
  6. 6Stir in the Mentaiko
    Adding a scoop of pink Mentaiko and mayonnaise paste to the creamy coated spaghetti in a pan.

    Turn off the heat completely. Add the prepared Mentaiko and mayonnaise mixture into the pan with the pasta. Stir vigorously to coat the noodles, adjusting the texture with a splash of pasta water or a squeeze of lemon juice if needed.

    Tip: It is crucial to turn off the heat before adding the Mentaiko. Cooking the roe over direct heat will cause it to seize up and become dry and grainy.
  7. 7Adjust sauce consistency
    Pouring a splash of cloudy pasta water into a pan containing creamy spaghetti to adjust the sauce texture.

    While the pasta is in the pan with the sauce, pour in a small amount of reserved pasta water. This helps emulsify the sauce, creating a smooth and creamy texture that coats the noodles evenly.

    Tip: Add the pasta water gradually to reach your desired consistency; a little goes a long way.
  8. 8Prepare Mentaiko sauce
    A bowl containing Mentaiko roe being mixed with lemon juice, cream, and seasonings.

    In a bowl, combine the prepared Mentaiko roe with fresh lemon juice, Japanese mayonnaise, a pinch of chili powder, a little sugar, and a splash of heavy cream. Mix all ingredients thoroughly until well combined.

    Tip: Use a whisk to ensure the cream and seasonings are perfectly incorporated with the roe.
  9. 9Toss with butter
    A knob of butter melting into a bowl of hot, freshly cooked spaghetti.

    Place the freshly cooked, hot pasta into a large mixing bowl. Add a generous knob of butter and toss the pasta immediately while it is still hot to ensure the butter melts and coats every strand.

    Tip: Tossing while the pasta is piping hot is essential for the butter to emulsify correctly.
  10. 10Combine with Mentaiko
    Adding Mentaiko sauce onto spaghetti in a bowl and mixing with chopsticks.

    Add the prepared Mentaiko sauce and a splash of soy sauce to the buttery pasta. Use chopsticks to toss and mix everything thoroughly, ensuring the noodles are evenly coated with the savory, creamy sauce.

    Tip: Use a lifting motion with the chopsticks to incorporate the sauce without breaking the noodles.
  11. 11Garnish with shiso
    Shredded green shiso leaves being scattered over the top of the Mentaiko spaghetti.

    Top the pasta with freshly shredded shiso leaves. Give the dish one final toss to combine the aromatic herbs with the creamy Mentaiko spaghetti before serving.

    Tip: Shred the shiso leaves just before adding to preserve their fresh, bright aroma.

Storage & Reheating

Refrigerator
1 day
Best eaten fresh as cream sauces and pasta texture degrade quickly; store in an airtight container.
Reheating
2 min
Gently reheat on the stovetop with a splash of water to loosen the sauce; avoid microwave to prevent breaking the emulsion.

Burn It Off

Leisurely Cycling
~90 minutes at a relaxed pace (~13 km/h).
Brisk Walking
~2 hours at a steady pace (~5 km/h).
Yoga
~2 hours and 45 minutes of mindful practice.

Frequently Asked Questions

While possible, Japanese mayonnaise is essential for the authentic taste and texture of this dish because it is made with egg yolks and rice vinegar, offering a deeper richness than standard western mayonnaise.
The secret is the pasta water. Reserve about a quarter cup of the starchy water you boiled the pasta in and add it tablespoon by tablespoon to the pan until you reach a smooth, glossy consistency.
The outer membrane is technically edible but has a tough, chewy texture that ruins the smooth mouthfeel of the sauce. It is best to scrape the roe out carefully as shown in the first step.
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