Wash the green Daikon and carrot. Grate them into thin strips. Place them into a bowl and sprinkle with 1 1/2 tsp of salt. Mix well and let them sit for 10 minutes.
After 10 minutes, squeeze out the excess moisture from the Daikon and carrot using your hands or cheesecloth to prevent the filling from being too wet.
Mince the ginger and chop the green onion into small pieces. Heat a small amount of oil in a pan, then sauté the ginger and green onion until slightly golden.
Add 100g of ground meat (pork, beef, or chicken) and cook until browned. Season with 1/2 tsp salt, 1 tsp light soy sauce, 1/2 tsp dark soy sauce, and 1/2 tsp chicken bouillon (optional). Stir well to combine.
Turn off the heat and mix the sautéed ginger, green onion, and meat into the bowl with the Daikon and carrot. Add 2 tsp of chili oil (optional) and stir well. The filling is now ready.