Add sapota in a blender/mixer add needed sugar and little milk and beat well.
Then add remaining milk and beat well.
Chikoo milk shake is ready.
Serve chilled.
Notes
Icecream(vanilla)can be added for more taste,richness and creaminess.
But it is not necessary because it tastes great as such.
You can add sugar according to your taste(so I have not given the exact amount).