Generally, vermicelli needs to be soaked in advance, otherwise the vermicelli will be hard. If it is soaked in cold water, it should be soaked two hours in advance. If you soak it in warm water, it will be ready in half an hour, and then you can fry it with vermicelli.
Matters needing attention in kohlrabi fried noodles:
Don't put the radish fried noodles on the plate immediately after frying. It's better to wait a little longer to let the vermicelli fully absorb the soup, so that the vermicelli will be more delicious. Simply stir-frying will not let the seasoning completely enter the vermicelli, so the taste will be lighter.
It would be much better if you stayed a little longer. Heat oil in a pan, add millet and stir-fry when the oil temperature is 70%, then add kohlrabi and stir-fry until soft.