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Heat water, boullion and green onions in a sauce pan over medium-high heat.
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Mix sugar, soy sauce, cornstarch and 2 Tbsp water in a small bowl until smooth and stir into broth. Bring mixture to boil high for 1 minute, then reduce to medium-low heat.
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Beat egg with 2 tsp cold water. Using a fork or wire whisk, stir egg mixture into soup and cook until eggs are done, about 2 mins.