To a cup, add a bit of ice to the bottom.
Then add a layer of orange juice so the cup is about 1/4 to 1/3 full.
On top of the orange juice, add the lemon-lime soda so the cup is almost full to the top.
Finally, add a splash of grenadine syrup. It will travel to the bottom of the cup to create the beautiful sunrise look.
Garnish with a maraschino cherry or an orange wedge and enjoy!