“Thank you” Gesture
Tea usually is served as soon as you have a seat in a restaurant. A waiter/waitress serves you tea while you read the menu and decide what to order. The tea pot is left with you on the table after everyone around the table’s cup is filled with tea. Guests then serve themselves.
When someone pours tea into your cup, you can tap the table with your first two fingers two or three times, showing thanks to the pourer for the service and of being enough tea. The pourer will stop pouring when seeing the gesture.