If you can still find some good fresh cherries you'll thank me for posting this beverage because it is nothing short of AMAZING!
Even better, you can make it boozey or non-alcoholic and either way you'll like it.
Like the original poster, I made this drink twice. The first time I muddled some cherries with a few basil leaves in a glass, added some simple syrup, vodka (you could add rum if you prefer) and club soda. Pretty much the same way as making a mojito. I’m not a big fan of chunky stuff floating in my cocktails. So I wanted to give it a try with a strawberry basil simple syrup to compare. Both methods produce a delicious, summer sipper so it really just depends on your preferences for chunks vs. no chunks. Using a cherry basil flavoured syrup produced a little bit sweeter drink, which for me is not a problem when I make a tall drink that contains ice and club soda. If you like your drinks not sweet, try the muddled option so you can control the amount of sweetener you add.

Cherry Basil Spritzer
For the Simple Syrup Version:
1½ shots Cherry Basil simple syrup (see directions below)
1 shot vodka
squeeze of fresh lemon juice
club soda
For the muddled fruit version:
4 or 5 fresh cherries, pitted
3 basil leaves
½ shot simple syrup (more or less to taste)
squeeze of fresh lemon juice
club soda
To make spritzer with cherry basil simple syrup:
Prepare flavored simple syrup by combining 1//2 C. sugar, ½ C. water, 1-1/2 C. pitted and roughly chopped cherries* in a saucepan and bring to a boil to dissolve sugar. Reduce heat, add a few basil leaves (not too many or it will overpower the cherry flavor) and let it simmer about 10-15 minutes to break down cherries. Set aside, let it cool. When cooled, pour mixture into fine mesh strainer and strain to remove solids.
In cocktail shaker combine cherry simple syrup, vodka, and lemon juice, Shake well, pour into a tall glass filled with ice. Top with club soda.
To make using the muddled fruit method:
Add cherries, basil, simple syrup to glass. Muddle well to break down the fruit. Add vodka, lemon juice, ice. Top with club soda. Stir to combine.
For a non-alcoholic version, simply omit the alcohol.