Negi miso

Name: Negi Miso
Prep time: 10 min
Cook time: 20 min
Total time: 50 min
Yield: 10
Ingredients: 1 spring onion; (A) 3 tbsp miso; (A) 2 tbsp mirin; (A) 2 tbsp sake; (A) 1 tbsp sugar; (A) 1 tsp grated ginger; (A) 2 tsp soy sauce; 2 g bonito flakes; 1 tbsp sesame oil