Now, on a heavy-bottomed large pan or pot, add sugar and the third pressed milk and heat on a medium flame. Make sure to keep on a medium flame and be near it to stir, else it may burn, and also it will overflow. By now two layers would have separated in the second and first extracted milk. Slowly decant and add the top clear liquid to the mixture that's cooking and reducing in quantity. Once that reduces to half the quantity, add the thick second extracted milk and repeat the process. Again, after this has reduced add the thick first extracted milk.
Continue to stir and cook. Slowly it would become much thicker. This is the stage to add the cornflour (mix with 2 tbsp water) and red food color. Make sure to stir continuously, so that it doesn't scorch at the bottom. Heat ghee in another pan, and start to add slowly a ladle full of ghee now and then as the mass thickens.
Crush the cardamom and clove to powder and add to the halwa. Continue stirring the thickening halwa and adding all the ghee (reserve a couple of tbsp) slowly. In a few reserved tbsp of ghee fry cashews and add to the halwa and keep stirring. After some time, some of the ghee that had been added before will ooze out a little and that's quite normal.
- Continuous stirring is essential. Making halwa is time-consuming and labor-intensive, so if you need help, plan ahead for a helping hand.
- Keeping on a medium flame is essential, as a high flame may burn the milk and cause it to overflow making a mess.
- As soon as you have extracted the milk, start to cook them. If you store for longer, it may develop a sour taste.
- Once you keep the third extracted milk with sugar on the stove, try and clean the grinder immediately, or else cleaning the sticky mass is very very hard.
- After you pour it onto a greased plate, you can remove the excess ghee that is there on the sides of the tray with a small spoon or ladle (this is optional). This ghee can be used later.
- If you do not want to slice it, and you prefer as a jiggly mass, you may omit the cornflour.
- Pure ghee brings out great flavor.