Cook the pasta

• Bring salted water to a boil and cook the pasta until al dente.
• Reserve some pasta water before draining.

Caramelize the mushrooms

• Fry the mushrooms in a large pan until nicely caramelized.
• Remove them from the pan and set aside.

Build the base

• Fry the onion in plenty of olive oil and butter until soft.
• Add the garlic and deglaze with white wine.

Add the miso

• Whisk the miso paste with some pasta water in a separate bowl.
• Pour the mixture into the pan.

Combine and serve

• Stir the mushrooms and cooked pasta through the sauce.
• Loosen with a little more pasta water and serve.