In a bowl take 2 tbsp of milk. Add 8-10 kesar (saffron) strings and microwave it for 30 seconds. After that dissolve the kesar with spoon and keep it aside.
In a pan heat 3 cups of milk at medium heat for 10 minutes. Stir it continuously otherwise milk may stick to the bottom of the pan. In between, add kesar (saffron) dissolved in milk.
Take ladoos and break them gently with the fork. After milk has boiled for 10 minutes add ladoos stir and cook for 5 more minutes.
In between taste the sugar and if needed add sugar at this time. Stir and let the kheer cook for 5 more minutes. After 5 minutes, switch off the heat.
Boondi laddu kheer is ready to serve. Garnish it with chopped mixed nuts.