First, allow the evaporated milk some time to cool in the fridge. That will help give it a much more refreshing flavor. And it makes it easier to serve immediately.
Add the sugar and vanilla extract to the chilled evaporated milk. Whisk the ingredients together so that they can become well combined.
Next, add the ice cubed and stir again. The ice will further help chill the evaporated milk.
Finally, top each glass with some orange juice and gently stir it. Serve it immediately with a fresh slice of orange.