Korean sweet potato noodles stir-fry

Main ingredients:

• 250 grams of Korean sweet potato noodles
• 400 grams of lean beef sirloin, sliced
• 1 tablespoon of soy sauce
• 1 teaspoon of sesame oil
• 5 dried shitake mushrooms, rehydrated in 1/2 cup of hot water, stems removed, sliced
• 1 teaspoon of soy sauce
• 1 teaspoon of sesame oil
• pinch of sugar
• 300 grams of spinach
• 1 red onion, sliced
• 1 carrots, cut into 5-inch julienne
• 1 red bell pepper, cut into 2-inch strips
• 1/2 green bell pepper, cut into 2-inch strips
• 300 grams of string bean, steamed, cut in 2-inch sections 
• 2 tablespoons chopped green onion
• 2 teaspoons of finely minced ginger
• 2 teaspoon of chopped garlic
• oil
  
  For the sauce:
• 3 tablespoons soy sauce
• 2 tablespoons sugar
• 1 tablespoon honey
• 1 tablespoon rice wine
• 1 tablespoon sesame oil
• 1 tablespoon sesame paste
• dash of freshly grounded black pepper