Take 200g of dry cashew nuts in a mixer jar. See that cashews are dry and fresh. Do not heat or roast it. By doing that it will release oil and makes it difficult to make Barfi.
Grind it to fine powder
Add 50-60 ml water in a pan.
Now add 100g of sugar to it. Take sugar and Cashew in 1:2 ratio.
Dissolve sugar to make syrup in a low flame. Do not allow the syrup to thicken.
Now add the powdered cashew into the syrup.
Stir in constantly for around 5-7 min. Break the loops and knots while stirring. The exact time depends on the flame you set. Low flame is recommended.
Stir till it forms a soft dough. Do not allow it to cool. If it cools it will harden and you won't be able to give shape.
Transfer the hot dough on a plane work surface. Apply a little ghee on the surface, just to avoid sticking of dough to the surface. Wear gloves if necessary.
Cover the dough with a butter paper. Apply a little ghee on the butter paper too. Using butter paper makes the surface smooth. You can directly roll without butter paper by applying little ghee to rolling pin.
Roll on the dough with a Rolling pin.
Make it around 5-6 mm thick and remove the butter paper.
Now cut it into diamond shape or any shape as you wish using a knife.
Put kesar (Saffron) strands on it and garnish with almonds, pistachios etc. This step is purely optional and has no significance to the recipe. Decorate as you wish and Kaju Barfi or Kaju Katli is ready to eat.