Some vegetables (especially vegetable cores) are not delicious when scalded for a long time, but will turn yellow and ugly when scalded for a long time.
So put some water in it when blanching, and the vegetables will soften quickly. The blanching time is not long, so that the appearance and taste can be maintained.
The ingredients for scooping water are all edible ingredients and will also be used when making moon cakes. So don't worry if you don't let go every time you cook.
If in doubt, please ask.