Almost-Instant Hot Kimchi

In a large pot, heat the oil. Add the onion, coriander and pepper powder and cook over moderate heat, stirring, until the onion begins to brown, 4 minutes. In a small bowl, whisk together the pepper paste, vinegar and fish sauce; add to the pot and cook over high heat, stirring, for 1 minute. Add the cabbage, pear and cucumber and cook, stirring, until the cabbage is just wilted, 3 minutes. Serve.