10-Minute Udon Noodle Soup

Name: 10-Minute Udon Noodle Soup
Prep time: 3 min
Cook time: 7 min
Total time: 10 min
Cuisine: Japanese
Ingredients: 423 g (1 lb) udon noodles (2 serving packages); 960 g (4 cups) Dashi stock; 20 ml (4 tsp) soy sauce (low-sodium); 20 ml (4 tsp) mirin; 16 g (4 tsp) sugar; 4 g (1 tsp) kosher salt; 8 g (2 tsp) sesame oil (optional; 2 stalks scallion (thinly sliced)