Tendency of rice sticking to bottom and getting burnt is more, so keep stirring as it cooks. Also you can grease the pan with little ghee beforehand.
You can pressure cook rice too which is the best option to avoid burning. But make sure you cook rice in milk not in water.
You can add cardamom powder and saffron for flavor and color. I wanted the milky white paal payasam for photo, so I did not add them.
The paal payasam thickens with time, so keep an extra cup of milk for the right consistency of payasam.
Once rice gets cooked, you can mash it too so that the rice breaks and payasam thickens.
Adjust sugar as per your preferences.