Slice onion, green onion, tofu, zucchini, beef, and kimchi into bite-sized pieces.
Heat sesame oil in a pot for doenjang stew, then stir-fry beef, kimchi, onion, green onion, and zucchini.
Add soybean paste (doenjang) and stir-fry everything together a bit more.
Pour in 350ml water and bring to a boil.
Add tofu and simmer over medium heat for 10 minutes.
Season to taste with red pepper flakes, minced garlic, and spicy green chili pepper if desired.
In a pan, heat sesame oil and stir-fry chopped kimchi and rice for 3 minutes.
Season the rice with soy sauce and salt to taste.
Serve the finished kimchi fried rice in a bowl accompanied by the doenjang stew.