Slice garlic, Dice onions and finely cut/ green chillies. Keep aside.
Dice Carrots and Capsicums and set aside. 

If you are using Basmati Rice/ Biriyani Rice, ensure that the rice is 
old otherwise, if the rice is new, toast the rice after soaking in water 
for ten minutes and draining all the  water, and toasting in a kadai in two 
spoons of ghee till the rice is very light creamy or pinkish looking. Toasting
 for about ten minutes  would do. This would ensure your rice grains remains 
separate when cooking. 

Now take rice and put directly in cooker without any separator. Best to use is
 Hawkins pressure cooker. Add needed salt.. Add enough water to cook the rice 
and the .Please ensure that you add just enough( 500 ML) for the above. But 
ensure that you use only old rice. Water quantity must be fixed by you as per 
the quality and quantity off rice you use. 

Take a little oil in a kadai and fry carrots till they are properly cooked.
You may pressure cook the carrots also after adding a little salt and sugar.
Take care not to over cook the carrots. 

Now take oil in a Kadai and add cinnamon, Cardamom, and cloves. When cloves 
and cardamom puff up , add Sliced Garlic, when Garlic turns very light pink,
 add Onions and sliced Green chillies. Light fry till onions become 
translucent , remove from fire and let it cool. Keep aside. Put a spoon
 of oil on a tawa and when its hot, tawa fry the Capsicum pieces briskly for
 a minute .When fine aroma of Capsicums comes, remove immediately from tawa
 and keep it spread in a plate and set aside. You must take care never to 
over fry the Capsicum and ensure that the green colour is not lost. 

When the rice is completely cold, add fried onions, garlic & chillies
to rice. Also add fried Capsicums and cooked /fried Carrots and salt,
and mix well. Take care and ensure that the rice has proper amount of
 oil and the rice is not dry. .Cover with a lid and set it aside for 
an hour to let the spices aroma permeate in Rice. 

Tri colour vegetable rice looks and tastes very different from the other
 rice varieties posted so far by me. You may try to prepare this rice
 with Ghee if you like. 
When you are serving this rice, reheat by placing in a micro or use
 indirect steam heating. You may also reheat in a non stick pan. But 
ensure that the rice is Hot. 

The special aroma of Capsicum adds a very different  dimension to this rice. 

This rice can be enjoyed with Raitha made of plain curd with cucumber
 /boondhi or Plantain. You may also make Kurma of Ghee Rice as an 
accompaniment