Cook the aromatics. Heat the cooking oil in a medium-sized pan over medium-high heat. Add mushrooms and cook 3-4 minutes, stirring gently. Add garlic and cook for 20 seconds. Add the kimchi and cook for 3 minutes.
Add the liquid. Pour in the kimchi liquid and vegetable stock, and add gochujang paste. Bring to a boil.
Cook the ramen. Add the noodles to the boiling broth and simmer for 2-3 minutes or until cooked.
Assemble. Ladle the kimchi ramen into bowls. Add the spring onions on top. Additionally, serve the kimchi ramen with halved hard-boiled eggs and black sesame seeds.
Notes
You can directly boil the noodles in the kimchi broth or cook them separately.
If you do not have gochujang paste, you can use Korean red pepper.
You can top the kimchi ramen with some edamame.
The hard-boiled egg is recommended because it helps tame the heat.