In a paper towel-lined baking tray, lay out grated cauliflower and sprinkle on salt. Mix and spread out in an even layer. Let sit for 20 minutes to release liquid from the cauliflower.
Meanwhile, heat a wok or large pan on medium-high then add about 1 tablespoon of oil. Saute onions until slightly soft, then add in garlic. Cook until garlic is soft and fragrant, about 30 seconds.
Add in gochujang and cook until onions and garlic are fully coated and the gochujang starts to slightly caramelize. Watch carefully so it doesn’t burn. Add in soy sauce, fish sauce, kimchi juice, and kimchi. Turn off heat and cover until cauliflower is done draining.
Optional but Recommended: Heat a small pan on medium-high heat, then add about 1 tablespoon of oil. Fry the egg to your preferred doneness, then remove and set it aside for serving.
Pat dry cauliflower to remove excess moisture, then reheat wok to medium-high heat.
Toss in cauliflower and spread in an even layer along the wok. Let it sit for about 30 seconds to 1 minute without touching it to create a char. Repeat 1 -2 more times, paying close attention that the cauliflower isn’t getting overcooked and too soft. Turn off the heat and finish with sesame oil, green onions, and egg if desired.
Notes
Gochujang: This is a Korean chili paste that's sweet, savory, and sometimes spicy depending on the heat level you choose. You can be easily found on Amazon or at local Asian markets. It's becoming increasingly popular so some grocery stores are also starting to carry it!
Light / Regular Soy Sauce: Light or regular soy sauce adds saltiness to the dish and can be found at most grocery stores.