Put a few ice cubes in the mugs.
Add half a cup of the Grenadine Syrup, this should be about one third of the dimpled mug.

Add a few dashes of Angostura Bitters (to your taste).
Add a squeeze of orange and lemon each.

Share the Fanta equally between the two mugs, do the same for the Sprite. Remember to leave some space because the garnishings will take up their own volume.

Add your sliced garnishings: cucumber, orange and lemons. some people even add bananas to theirs.