Place a large skillet over medium-high heat.
Add the neutral oil and heat until shimmering.
Add the onion, cabbage, and carrots and cook until softened.
Add the garlic and scallion whites and cook, stirring constantly, until fragrant.
Add soy sauce, fish sauce, sugar, sesame oil, chicken bouillon, beef bouillon, and water.
Stir continuously until the bouillon dissolves and the sauce begins to gently simmer.