Set a pot of water to boil for the pasta. Once boiling, salt the water, add the pasta, and boil to just before al dente. Reserve 1 C of the pasta water.
8 Oz. Pasta
Get the sauce started while you boil the pasta. It takes 12-13 minutes to cook before you need the reserved pasta water.
Heat the butter and olive oil in a wide skillet over medium-high heat.
2 Tbsp Butter, 1 Tbsp Olive Oil
Once the butter is melted, add the mushrooms. Arrange them in a single layer in the pan and let them cook for 2-3 minutes to start browning.
8-10 Oz. Mushrooms, Sliced
After the initial browning, stir every minute or two, continuing to cook the mushrooms until they are deeply golden and their moisture has cooked off. Lightly salt them once golden.
Salt and Fresh Ground Black Pepper to Taste
Cut the heat to medium. Mash the black garlic into a paste and add 2/3 of it to the mushrooms (save the last third for the end). Cook the garlic in the mushrooms for 30 seconds to warm it up. Be sure not to cook it too long or it will change the flavor.
5-6 Cloves Black Garlic, Peeled
(Optional): add the white wine and stir 30 more seconds to help deglaze the pan.
1 Tbsp Dry White Wine for Deglazing
Add the cream and 1/4 C of the reserved pasta water. Bring it to a simmer for 2-3 minutes to thicken slightly.
3/4 C Heavy Cream
Cut the heat to low and add the pasta. Toss the pasta with the sauce to finish cooking. Add more reserved pasta water as needed until the sauce is glossy and loose.
Turn the heat off and mix in the Parmesan cheese. Mix until fully emulsified, adding pasta water as needed.
1/2 C Finely Grated Parmesan Cheese
Stir in the remaining black garlic and season the pasta with salt and pepper to taste.
Serve right away topped with more fresh cracked black pepper and Parmesan cheese.