This is not an authentic Korean dish but rather one I adapted from a japanese noodle soup dish (also probably not authentic but referes to the flavors :)
8 oz mushroom, chopped
4 cloves garlic, minced
2 tsp ginger, minced
1 Tbsp oil
6 C vegetable broth
2 1/2 C water
2-3 Tbsp doenjang (soy bean paste, if you use miso you are probably going to need more because it isn't as strong as doenjany)
1/4 C green onions, sliced thin
noodles (you can use any you want but I often use kal guk su noodles), probably about 10oz :)
For people who know...this actually turns out a little more like jajangmyeon...