Dry roast the sesame seeds in a pan on medium flame until brown.
Let it cool down.
Now heat the pan/kadhai, add jaggery and some water and bring it to boil.
Make a thick syrup.
Turn off the flame .
Add melted jaggery syrup to the roasted sesame seeds and mix well.
Divide this mixture into equal portions and shape into lemon-sized ladoos.
Start making ladus immediately while the mixture is still hot, once it cools down you may not be able to shape it properly.
So your Til ke Laddoo is ready.
Store it in air-tight container.
Notes
You can always check the consistency of jaggery by putting a small drop in chilled water.
The consistency of jaggery is right if the ball forms immediately.