Combine coffee and water to make a lump free concentrate

Freeze it overnight in an ice cube tray

When you desire to make, take milk in a blender add 1 tsp or more sugar (as per liking) and give a nice blend.

Nicely blend till you get a nice froth

Now take out the coffee cubes
Put them in the glass you wish to serve.

Pour the chilled milk over the coffee cubes in the glass.
Fill 3/4 of the glass

Then place the froth carefully with the help of a spoon

Enjoy chilled cold coffee

Note:
The coffee should be very strong.
You can add creamer to the milk, to make it thick & rich, though I used low fat milk.

Secondly it can be made with hot milk too.