It is important that Sugar syrup is ready before the Gulab Jamun's are completely fried.
String consistency of Chashni is nothing but a measure of it's thickness. The thicker it is, the more strings it would show up.
You can make fry and make Chashni simultaneously to save time. If you are doing so, wait for the first boil in Chashni boil and then add Gulab Jamun for frying.
Make sure Chashni is warm before adding Gulab Jamun.
Gulab Jamun with Khoya Recipe https://www.inhouserecipes.com/gulab-jamun-recipe/ May 9, 2013