Japchae (Quick Korean Noodle Stir-Fry)

Bahan-bahan (4 porsi)

• 8 ounces dangmyeon (sweet potato starch noodles)*
• 2 tablespoons olive oil (or any mild-flavored oil), divided
• 1 small white onion, thinly sliced
• 6 shiitake mushrooms, thinly sliced
• 1 red bell pepper, cored and thinly sliced
• 1 carrot, peeled and thinly sliced
• 3 g arlic cloves, minced or pressed
• 3 handfuls fresh baby spinach
• toppings: toasted sesame seeds, thinly-sliced green onions
• 1/4 cup low-sodium soy sauce* (or more, to taste)
• 2 tablespoons maple syrup
• 1 tablespoon toasted sesame oil
• 1 pound sirloin or flank steak, thinly-sliced against the grain into bite-sized pieces
• 1 tablespoon soy sauce
• fine sea salt and freshly-cracked black pepper