Take ⅓ cup of grated jaggery. Add ⅓ cup water and a generous pinch of cardamom powder.
Let it boil so that jaggery dissolves completely. Strain the syrup for impurities.
Add filtered jaggery syrup to a kadaai and let it boil well. In a bowl of water, add few drops to check the consistency of syrup.
You should be able to gather the drops to a mass and roll it into a soft ball. If this consistency is reached, simmer and add roasted peanuts to the syrup.
Mix well so that all syrup are coated well. Keep a ghee-greased plate ready by the side.
Transfer the contents to the greased plate. Remove the peanuts stuck to the ladle with a spoon. Spread and try to break any long bunches.
Once cooled, immediately transfer to mixer in batches and grind it slightly coarse(without any bits, though). Do not pulse it for a long stretch. Check for every 2 pulses. Take off any peanuts that stand still without grinding and put it in the next batch. In the last batch, if 1 or 2 peanuts do not grind, just eat it ;) Else, too much grinding will make the rest of the peanuts so sticky !
Take some and just roll the ladoo(not tightly) between your palms for perfect shape ! Store in air-tight container and enjoy for a week !
Notes
Add cardamom powder after filtering the syrup for rich flavor.
Recipe by My Healthy Kiddo at https://www.myhealthykiddo.com/peanut-laddoo-using-jaggery/