Heat chicken broth and green onions in a large pot over medium-high heat. Mix sugar, soy sauce, cornstarch, and 1/3 cup of cold water in a bowl until smooth. Reduce heat and stir soy sauce mixture in to the broth. Boil soup on high for 1 minute, then reduce heat
In a large saucepan, dissolve bouillon in hot water. Mix cornstarch with a small amount of water, and stir into bouillon. Add soy sauce, vinegar, and green onion. Bring to a boil, then simmer, stirring occasionally. Gradually..