Boil spaghetti in boiled water that mixed with salt, add mushroom 1 minute before removing.

Heat butter, saute onion and garlic until fragrant, add spaghetti and mushroom, stir well.

Mentai mayo sauce: mix well tobiko, chili sauce, and KEWPIE MAYONNAISE ORIGINAL.

Prepare plate, add spaghetti and mushroom, mix with mentai mayo sauce. Add nori, serve.