spicy soba noodles with shiitakes

INGREDIENTS

• 1/3 cup water
• 1/3 cup soy sauce
• 2 to 3 teaspoons Korean hot-pepper paste (sometimes labeled “gochujang”)
• 1 tablespoon packed brown sugar
• 3 tablespoons sesame seeds
• 1/4 cup vegetable oil
• 2 tablespoons finely chopped peeled ginger
• 1 tablespoon finely chopped garlic
• 10 ounces fresh shiitake mushrooms, stemmed and thinly sliced
• 1 1/4 pound Napa cabbage, thinly sliced (8 cups)
• 6 scallions, thinly sliced
• 8 to 9 ounces soba (buckwheat noodles)
• 1 cup frozen shelled edamame