Creamy Mushroom Penne
Hot Spring Egg

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Indulge in this foolproof creamy mushroom penne, crowned with a perfectly poached hot spring egg and grated Parmesan for a luxurious, savory finish.

↓ The ingredients ↓ The steps

There is something uniquely comforting about a rich, earthy mushroom cream sauce clinging to perfectly al dente penne. The addition of a delicate hot spring egg—or onsen tamago—elevates this simple weeknight dinner into a luxurious experience. When pierced, the velvety, slow-poached yolk creates an instant, impossibly rich sauce that binds every bite together.

A dark ceramic bowl filled with creamy mushroom penne, topped with a soft hot spring egg and grated Parmesan.
A dark ceramic bowl filled with creamy mushroom penne, topped with a soft hot spring egg and grated Parmesan.
Prep10 mins
Cook25 mins
Total35 mins
Yield1 serving
DifficultyMedium
Calories650 kcal

Ingredients

Instructions

  1. 1Poach the eggs
    Two eggs gently poaching in a pot of hot water.

    Bring a pot of water to a boil, remove from heat, and add a quick splash of cold water to slightly drop the temperature. Carefully lower two eggs into the hot water, cover, and let them poach in the residual heat for 12 minutes.

    Tip: Keep the water just below a rolling boil to prevent the eggs from breaking while poaching.
  2. 2Mince the onion
    Finely diced onion pieces on a blue cutting board.

    Using a sharp knife, carefully mince the onion into fine, even pieces on a cutting board.

    Tip: Use a sharp knife to avoid crushing the onion layers, which keeps the pieces neat and reduces eye irritation.
  3. 3Cook the penne
    Dry penne pasta being added to a pot of bubbling boiling water.

    Add 100 grams of penne pasta to a large pot of boiling water. Cook for 12 minutes until al dente, then drain and toss lightly with a little oil to prevent the noodles from sticking.

    Tip: Make sure to salt your pasta water generously to flavor the noodles from the inside out.
  4. 4Sauté the mushrooms
    Fresh mushrooms sautéing in a pan with hot oil until golden.

    Heat a thin layer of oil in a frying pan over medium heat. Add the mushrooms and sauté until they turn golden brown.

    Tip: Dont crowd the pan, as this will steam the mushrooms instead of browning them.
  5. 5Prepare the creamy sauce
    Heavy cream being poured into a pan with sautéed mushrooms and onions to create a thick sauce.

    Add the minced onions, salt, and black pepper to the sautéed mushrooms. Pour in a ladle of pasta water and some heavy cream, then simmer until the sauce thickens.

    Tip: Using a ladle of starchy pasta water helps the sauce emulsify and cling better to the pasta.
  6. 6Combine pasta and sauce
    Cooked penne pasta tossed into a pan with creamy mushroom sauce and grated Parmesan.

    Add the cooked penne pasta and a generous amount of Parmesan cheese to the pan. Toss everything together until the pasta is well-coated in the creamy mushroom sauce.

    Tip: Add the cheese while the heat is still low to ensure it melts smoothly into the sauce.
  7. 7Melt the cheese into the sauce
    Cooked penne pasta being tossed in a creamy mushroom sauce with grated Parmesan cheese in a pan.

    Continue to toss the cooked penne in the mushroom cream sauce over low heat. Sprinkle a generous amount of freshly grated Parmesan cheese over the pasta, folding everything together until the cheese melts and emulsifies into a thick, glossy coating.

    Tip: If the sauce becomes too thick, add a small splash of reserved pasta water to loosen it up.
  8. 8Plate the pasta
    A close-up of a poached egg being placed in the center of a bowl of creamy penne pasta.

    Transfer the creamy mushroom pasta into a serving bowl. Using a spoon, create a small indentation in the center of the noodles and carefully place the poached egg on top.

    Tip: Handle the poached egg gently to keep the yolk intact for a beautiful presentation.

Storage & Reheating

Refrigerator
Up to 3 days
Store the pasta and cream sauce in an airtight container. Do not store with the hot spring egg; make a fresh egg when serving.
Reheating
5–8 min
Reheat gently on the stovetop over low heat. Add a splash of milk or water to help loosen the cream sauce.
Freezer
Not recommended
Dairy-based cream sauces tend to separate and become grainy when frozen and thawed.

Burn It Off

Running
~65 minutes at a steady pace (~10 km/h).
Brisk Walking
~2 hours 10 minutes at a brisk pace (~5 km/h).
Gym
~1 hour 30 minutes of moderate strength training.

Frequently Asked Questions

The trick is to remove the boiling water from the heat source completely before adding the eggs. Adding a splash of cold water drops the temperature just enough so the eggs poach gently in the residual heat, yielding tender whites and a runny yolk.
Cream sauces can split or curdle if boiled too vigorously. Keep the heat at a gentle, rolling simmer once the heavy cream goes into the pan, and toss the pasta gently.
Absolutely. While penne is excellent for trapping the creamy sauce inside its tubes, spaghetti, fettuccine, or any dried pasta you have on hand will work wonderfully with this mushroom sauce.
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