Japchae (Korean Glass Noodle Stir Fry)

Name: Japchae (Korean Glass Noodle Stir Fry)
Prep time: 15 min
Cook time: 20 min
Total time: 35 min
Cuisine: Korean
Ingredients: 8.8 oz (250g) pork loin (or beef, chicken) (use lean parts); 1/2 yellow onion; 1.8 oz (50g) carrot; 1.8 oz (50g) red/yellow bell peppers; 1.8 oz (50g) shiitake mushrooms; 1.8 oz (50g) garlic chives; 4.2 oz (120g) Dangmyeon noodles (당면); 1/2 tbsp dark soy sauce (optional); 1.5 tbsp toasted sesame oil; 2 tbsp neutral-tasting oil; salt and pepper, to taste; 1 tbsp minced garlic; generous pinch of toasted sesame seeds, to garnish; 1.5 tbsp sugar; 1.5 tbsp soy sauce; 1 tbsp oyster sauce; 1/2 tsp MSG (optional)