Grind all the dals separately into fine powder. Soak each in water for half an hour. Strain and mix together.
Heat oil. Fry the dals on low heat till slightly brown in colour and a sweet smell starts coming from the mixture.
Put in 2cups of milk and 2 cups of water. Cook for some time. Add yellow colour and sugar. Cook stirring continuously till it leaves the sides of the pan. Grate khoya and add. Mix well.
Let the mixture cool and then press through a sevia making machine onto a greased pan. Press and cut into pieces. Decorate with cashew nuts.