Add instant coffee, sugar, water into whisk bowl. Ratio 1:1:1, hence may optionally change each ingredient portion to 1/2/x teaspoon preferably. For less sweet, may slightly reduce sugar portion with ratio 1:0.75:1.

Whisk the mixture to soft peak. Colour will change from dark coffee colour to light brown colour.

Add ice cube into glass, and pour at least 3/4 glass of milk.

Pour the whisked mixture on top of the glass of iced milk.

Stir well. Viola!