How to Make It
Heat the canola oil in a large pot. Add the onion and garlic and cook over moderate heat, stirring occasionally, until softened, about 5 minutes. Add the water and doenjang and whisk until dissolved. Add the soy sauce, brown sugar and kochukaru and bring to a boil. Add the bean sprouts and zucchini and cook until the zucchini is just tender, about 2 minutes. Add the tofu cubes and cook until the tofu is heated through, about 2 minutes. Ladle into bowls, garnish with the sliced chile and serve.
Doenjang and kochukaru are available at Korean and Asian markets.