Step by step

1. 1 Cut the onion into strips and the chives diagonally.
2. 2 Cut the green pepper into thin strips.
3. 3 Break the oyster mushrooms with your hands.
4. 4 In a bowl, mix together the soy sauce, sugar, chopped garlic and sesame oil.
5. 5 Sauté the mushrooms in a frying pan over medium-low heat and set aside.
6. 6 In the same pan, sauté the onion, green pepper and chives.
7. 7 Add the sautéed mushrooms and tteok.
8. 8 Add water until lightly covered and add the sauce.
9. 9 Boil until the tteok is soft and reduce until the sauce thickens.