To a sauce pan add 1/2 cup jaggery along with 1/4 cup water. Heat it up.
Boil well until jaggery melts completely. No need to check for consistency just let jaggery melt that is enough. Switch off, remove and set aside.
Add 1 cup peanuts to a heavy bottomed kadai. Roast until golden transfer to a plate and set aside.
Now to the same kadai strain and add the jaggery syrup.
Let the syrup boil, add a tiny pinch of salt along with 1/4 teaspoon cardamom powder.
Give a quick mix. Let the syrup boil.
At one stage the syrup becomes frothy and thick check by adding it in water - the syrup should not dissolve, if you take and roll it will form a ball, now as you can see it is soft ball consistency.
Cook for few more seconds and you can easily form hard ball like this - this is called hard ball consistency. If you drop it on a steel plate it will give a sharp 'tang' sound. This is the perfect stage so switch off.
Add roasted peanuts.
Mix it well quickly. Remove from flame.
Grease your palms with ghee and shape them into small balls.
Kadalai Urundai or Kadalai Mittai is ready!
At the last it may be hard to roll so heat up the kadai so that the mixture loosens a bit, then shape them.
Kadalai urundai is ready!