Why is the Ejiao chicken soup in the hotel so strong?

Gum chicken soup is thickened with starch, and the boiled soup will be very thick. The practice is as follows:

Preparation materials: gelatin 70g, salt, Adenophora adenophora 20g, Polygonatum odoratum 20g, starch 5g.

First, the glue should be soft.

Second, wash Polygonatum odoratum and Radix Adenophorae.

Third, wash the old hen and cut it into large pieces.

Fourth, put the above materials into a pot and cook for about 2 hours, then add starch and salt to taste.

Fifth, you can eat it in a bowl.