Wafu Mushroom Pasta

Bring a large pot of generously salted water to a boil for the pasta. While waiting, prepare the mushrooms. For shiitake, remove and discard the tough stems and slice the caps into 1/4-inch pieces. For shimeji and enoki, trim off the root base and separate the clusters into individual mushrooms or small bunches. For maitake and oyster mushrooms, tear into bite-sized pieces along their natural lines. Using a variety of mushrooms creates more interesting textures and flavors, but even a single variety works well. The total weight of prepared mushrooms should be about 8 ounces - they will shrink significantly during cooking.

Cook the pasta in the boiling salted water according to package directions until just al dente - about 1 minute less than the recommended time since it will finish cooking in the sauce. Before draining, reserve at least 1 cup of the starchy pasta cooking water - this is essential for creating a glossy, cohesive sauce. The starch in the water helps emulsify the butter and soy sauce into a silky coating for the pasta. Drain the pasta but do not rinse it.

While the pasta cooks, heat the vegetable oil and 1 tablespoon of the butter in a large skillet or wok over high heat. When the butter foams and the pan is very hot, add the prepared mushrooms in a single layer. Let them cook without stirring for 1-2 minutes to develop golden brown color on the bottom. Toss and continue cooking for another 3-4 minutes until the mushrooms are golden, slightly crispy at the edges, and have released and reabsorbed their moisture. Season lightly with salt. The high heat and initial period without stirring are key to achieving caramelized, flavorful mushrooms rather than soggy, steamed ones.

Reduce the heat to medium and push the mushrooms to one side of the pan. Add the remaining 3 tablespoons of butter to the empty side and let it melt. Add the minced garlic to the butter and cook for about 30 seconds until fragrant but not browned - burnt garlic will make the dish bitter. Pour in the sake and let it sizzle and reduce for about 30 seconds, scraping up any browned bits from the pan. The alcohol will cook off, leaving behind a subtle sweetness and depth.

Add the drained pasta directly to the skillet with the mushrooms. Pour in the soy sauce, mirin, and about 1/4 cup of the reserved pasta water. Toss everything together vigorously over medium heat for 1-2 minutes, adding more pasta water as needed to create a glossy sauce that clings to the noodles. The starchy pasta water will emulsify with the butter and soy sauce to form a silky coating. Season with black pepper. Taste and adjust - add more soy sauce for saltiness, more butter for richness, or more pasta water if the sauce seems too thick or dry.

Remove from heat and add the white and light green parts of the sliced green onions, tossing to combine. Transfer the wafu mushroom pasta to serving bowls, twirling it into attractive nests. Top generously with the traditional Japanese garnishes: dark green parts of the sliced green onions, thin strips of shiso (perilla leaf) for a bright, herbaceous note, strips of nori for umami and visual contrast, and a sprinkle of toasted sesame seeds. A light dusting of shichimi togarashi adds gentle heat for those who enjoy it. Serve immediately while the pasta is hot and the sauce is glossy. Wafu pasta is best eaten right away - like all butter-based pasta dishes, it can become heavy and congealed as it cools. The combination of the savory butter-soy sauce, earthy mushrooms, and fresh garnishes creates a dish that is unmistakably Japanese yet comfortingly familiar to any pasta lover.