When jaggery syrup boils well, start checking the jaggery syrup
Take a little jaggery syrup in a water
The first stage - is immersed in the water
The second stage - syrups stay in the water but we can't roll it
The third stage- syrup stays in the water and you can combine it into a soft ball (not so firm and you can easily press it)
In the fourth stage- syrup stays in the water and you can combine it into a ball (it turns firm in a few seconds). That is the consistency we are looking for. Avoid hard/ stone consistency