Kake Soba (Simple Hot Soba Noodle Soup)

Name: Kake Soba (Simple Hot Soba Noodle Soup)
Prep time: 2 min
Cook time: 13 min
Total time: 15 min
Cuisine: Japanese
Ingredients: 2 tsp Japanese dark soy sauce (koikuchi shoyu) (or tamari for GF); 4 tsp Japanese light soy sauce (usukuchi shoyu); 1 tbsp mirin; ¼ tsp sugar; ½ tbsp sake; 500 ml dashi stock (homemade kombu-katsuobushi or quality dashi packet); 3 g bonito flakes (katsuobushi) (approximately 1 small handful for 3g); 2 portions soba noodles (dried, fresh, or frozen, 100% juwari soba for GF); finely chopped green onions; Japanese chili powder (shichimi togarashi) (optional topping); yuzu peel (optional topping)