Divide beef base, kimchi, chili-garlic sauce, mushrooms, beef, and noodles between 4 resealable glass jars. Divide scallions between 4 small zipper-lock bags and seal bags, squeezing out all of the air. Tuck bags into jars and seal. Refrigerate for up to 4 days.
When ready to serve, remove scallion packet and add boiling water to the top of the jar. Seal jar and let sit 2 minutes. Open jar, stir in scallions, and serve.
