Cut the green onions into 5cm pieces.
Heat some cooking oil in a pan and preheat.
Place the green onions in the pan and grill over medium-low heat, rolling them until golden brown.
Mix soy sauce, sugar, and mirin to make the sauce.
Pour the sauce over the grilled green onions and simmer briefly.
Transfer to a plate and finish with a drizzle of sesame oil and a sprinkle of sesame seeds.