Take aluminium big conman and boil the milk for 25 minutes on medium flame and in between you can low the flame also and stir it properly in-between and after 15 minutes of boiled milk you have to add sugar and stir it well.

Put chopped almonds and walnuts in a little bit of water and soak it for half hour.

When milk + sugar is boiled properly low the flame and add chopped almonds and walnuts (remove water from it)
And stir it well and boil it for 5 minutes, now cool it down and put in refrigerator and cool it and then drink.
Your tasty walnuts rabdi is ready.