Add 11/2 litre of milk, and cook of in simmer, stirring it every few minutes, the reason I use he pressure cooker to cook my kheer and halwas is that the thick bottom helps prevent burning.
when you see that the milk is staring to reduce, add the sugar, mix well and cook on a high flame for 5 to 7 minutes, while stirring continuously.
Add ricota cheese( khoya) mix well and cook for more 10 minutes, so that the khoya melts completely keep stirring.
Add the raisins, cashews and cardamom powder and cook for another 4-5 minutes.
Serve hot or warm.
Recipe by Khatta Meetha at http://khattameetha.com/dessert/gajar-ka-halwa-carrot-pudding