In a wide pan, dry roast the sesame seeds on low flame until it changes the color and starts popping. Transfer the content to a plate and cool down.
To the same pan, add shaved or powdered jaggery and add water. Stir until the jaggery melts.
Once the jaggery melts, filter to remove the impurities. Transfer the filtered jaggery syrup back to the pan. Heat it.
The jaggery syrup started bubbling first and then reduced in it's quantity and the color became dark. Drop of a bit of syrup into a bowl of water. It forms a softball and stays firm. This is the correct softball consistency.
At this stage, turn off the stove and add roasted sesame seeds and green cardamom powder.
Stir just until everything mixed well. Coat your hand with oil or moisten it with water and start making the laddu while the mixture is still hot. If needed touch the water in between to avoid burning of your palm.
Repeat the laddu-making process until the mixture is over. if the mixture becomes dry and unable to shape laddu, slightly warm it up to finish the process.
Once the laddus are cooled down, store it in a clean airtight containter.