In a pot of boiling salted water cook pasta according to pack instructions, 1 minute less than required. Strain pasta and set aside, reserving some pasta water.

In a large pan over medium heat, add in olive oil and butter. Add in garlic and onion, and saute until fragrant.

Add in mushrooms. Cook for about 10 minutes until mushrooms are nicely caramelised.

Add cream, miso mixed with hot water and mix well. Add in truffle paste and salt. Mix evenly.

Add in pasta and pasta water (optional), mix well to emulsify.

Plate pasta and garnish (optional) with egg yolk, truffle oil and furikake.