I used:
1 t sesame oil
1/2 onion
2 cloves garlic
1/2 zuchinni
1/3 Chinese cabbage
1/2 cup thinly sliced daikon (radish)
2 green onions
1 cup diced tofu
2-3 T doenjang (fermented soybean paste)
1 T gochujang (red chili paste)
1 t red pepper powder
1 t dashida (Korean beef stock) for that nice msg flav
1 t soy sauce, because despite said msg, I still wanted more salt
I cooked the onions and garlic and then threw the rest into the pot with about 4-5 cups of water. Walked away for about 20 minutes and when I came back, dinner was ready. Serve with rice. Because I'm a beast and am constantly concerned that I don't consume enough calories, I like to throw a raw egg into many of my Korean soups and mix it around in the final minute of cooking. Completely unnecessary.
Here's another recipe from my favorite Korean cooking site for this type of soup: dubu-doenjangjjigae