Combine and blend all ingredients for nori paste until smooth: 1 pack nori seaweed snack, 2 tbsp olive oil (add more if too dry), 1 egg yolk, 2 cloves garlic, salt and pepper as needed.
Cook pasta according to package directions.
In a pan, heat 2 tbsp olive oil.
Add 1 cup mushroom and 1 chopped spring onion, sauté until softened.
Add the cooked pasta to the pan.
Add 1 small cube unsalted butter and a bit of pasta water.
Add the prepared nori paste.
Stir everything together until well combined and creamy.
Season with salt and pepper to taste.
