Add the soy sauce, honey, gochujang, mirin, and sesame oil to a medium bowl and whisk well until the honey is combined and no longer thick and sticky.
1/2 cup soy sauce, 1/4 cup honey, 1-3 Tablespoons Gochujang paste, 2 Tablespoons sesame oil, 2 tablespoons Mirin
Cook the noodles in a large pot according to the package instructions. While they're cooking, finish the rest of the dish.
16 ounces udon noodles
Heat the sesame oil in a large skillet or wok over medium-high heat. Add the mushrooms when the oil is hot and begins to shimmer. Stir fry the mushrooms for 3-4 minutes, without stirring, to get them golden and crispy.
2 tablespoons sesame oil, 16 ounces baby bella mushrooms
Turn the heat down to medium and add the ginger and garlic and cook for 2-3 more minutes, stirring occasionally. Add 2 tablespoons of the prepared sauce and continue to cook for another 1-2 minutes until the mushrooms begin to cook down and caramelize.
1 teaspoon fresh grated ginger, 4 cloves garlic
Pour the remaining sauce into the skillet and bring to a simmer over medium heat. Reduce to medium-low and simmer to thicken, 2-3 minutes.
Add the cooked and drained noodles to the sauce. Use tongs to toss them together until the noodles are completely coated, 1-2 minutes. Garnish with toasted sesame seeds, Thai basil, sliced green onion, chopped peanuts, or Thai red chiles before serving