Chicken Katsu Udon Soup Recipe

Name: Chicken Katsu Udon Soup Recipe
Ingredients: 4 scallions, white and light green parts kept separate; 1 tablespoon neutral oil; 1 yellow onion, peeled and sliced; 8 ounces cremini mushrooms, thinly sliced; 2 teaspoons minced ginger; 4 cloves garlic, minced; 5 cups water; 2 teaspoons dashi granules; ¼ cup light soy sauce, more to taste; 2 tablespoons mirin; 2 teaspoons sesame oil, divided; 16 ounces frozen or dry udon; 10 ounces broccoli florets; 2 teaspoons sesame seeds; Salt; 1 pound thin-sliced chicken breasts; 1 cup all-purpose flour; ½ teaspoon white pepper; 1–2 teaspoons shichimi togarashi; 4 eggs; 2 cups panko; Salt and pepper; Vegetable oil for frying