Start making your Roy Rodgers drink by cutting the lemon in half. Cut one side into wedges and set aside.
Next, add your 1 cup of ice to a tall glass.
Crack open a can of coke and pour half of it directly over the ice. Use a stirrer or long spoon to mix the ice and chill the cola.
Next add in the grenadine and the juice of the lemon half (use all but one of the wedges too if you like it a bit more tart), also pouring them directly over the ice where possible.
Use your stirrer once more to give your drink a good, final mix.
Wedge the last lemon slice onto the side of your tall glass.
Finally, grab 1 or 2 candied cherries and gently set them on top to garnish your Roy Rogers.