In a blender, add milk, water and chopped mangoes. Add ice and blend it well. Make sure that the shake is thick, so you can add a little bit of ice-cream to it. Once the mango shake is ready, pour it into your choice of glass leaving a quarter of the glass empty.
Now add a big scoop of vanilla ice-cream and garnish with your choice of nuts and a cherry. Serve it right away before the ice-cream melts.