Give a quarter turn to the bowl and repeat the operation. Continue like this until the bowl has made at least one complete turn. In French this kneading manœuvre is called a "rabat".
Cover the bowl again and leave to rest in a warm place for 20 minutes.
This sequence of "rabat" + 20 minutes resting should be done 3 times.
Note: The "rabat" technique is rather hard to describe, so you can watch it in the video on the right.