Prepare all the ingredients in advance so the cooking process flows smoothly.
In a bowl, combine the Chinese cooking wine, soy sauce, sugar, oyster sauce, and MSG if using. Mix well and set aside.
Heat the wok or large pan over medium heat and add the vegetable oil.
Add the onion, garlic, and ginger and stir for about 30 seconds until fragrant.
Add the carrot, christophene, and bell peppers and continue cooking for 2 to 3 minutes.
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Add the shredded cabbage and stir well. As it hits the hot pan, you’ll hear an immediate, lively sizzle as any remaining moisture reacts with the heat. A cloud of steam will rise almost instantly, carrying with it the deep aroma of the garlic and ginger as they bloom even further. The cabbage will begin to soften at the edges while still holding its structure, turning glossy as it absorbs the flavors in the pan. Keep tossing so everything gets coated evenly and that gentle sizzle continues, letting you know you’re building flavor with every movement.
Season with salt and continue to stir to combine.
Pour in the prepared sauce and mix well to coat all the vegetables evenly.
Cook over medium to high heat, stirring as needed, until the cabbage reaches your preferred texture, about 5 minutes.
Just before turning off the heat, drizzle in the toasted sesame oil and stir to finish.
Taste and adjust salt as needed before serving.