Take crushed jaggery in a bowl. Add water to it and let it dissolve. Leave it for an hour so that the jaggery dissolves in the water.
Keep stirring intermittently to make sure the jaggery is completely dissolved. It might take extra time (depending upon the quality of jaggery). Alternatively, you can heat it.
Once all the jaggery is dissolved, filter the solution to a thick bottomed vessel.
On a low flame, boil this syrup slowly while stirring intermittently. Do not boil on medium or high flame as this will burn your jaggery syrup.
Boil it till sticky consistency. Keep stirring while boiling.
Let it cool and transfer to a container and store in the refrigerator.
Use when needed.