Heat butter in a frying pan and fry onions. When onion becomes transparent, add bacon and shimeji mushrooms and fry.
Cook spaghetti al dente with salt to taste.
Combine milk, eggs and bouillon in a bowl. Add (1) and mix well. When thickened, add fresh cream and 2 teaspoons of S&B Wasabi Paste then mix.
Add drained spaghetti to (3) and season with salt and black pepper. Garnish using the remaining S&B Wasabi Paste and serve.
Simply squeeze out desired amount to enjoy the authentic taste at any time.