First make thick juice of Kiwi, Banana & Black Grapes separately.If needed we can add sugar & milk/water.
Take a glass, put juice in the glass one by one and make a layer. So it looks separate, separate layer of juice in glass.
Finally put one piece of kiwi on top of glass.
And " RAINBOW FRUIT SHAKE " is ready.
Notes
Juice is always little thick, so we can make layer easily.Put juice inside the glass with free hand & slowly.If Sugar is required then only can mix otherwise avoid sugar.