Simmer the broth: In a medium saucepan, bring the broth, soy sauce, sesame oil, and ginger to a gentle simmer over medium heat.
Thicken (optional): In a small bowl, mix the cornstarch with 2 tablespoons of water. Stir into the broth and simmer until slightly thickened.
Whisk the eggs: In a separate bowl, beat the eggs until well combined.
Add the eggs: Slowly pour the whisked eggs into the simmering broth while stirring gently in one direction to form thin ribbons.
Finish and serve: Add sliced green onions, salt, and white pepper. Serve immediately with your favorite toppings or sides.