Strain into a chilled glass filled with fresh ice.
Add a splash of club soda (or sparkling water/lemon-lime soda) and a few drops of grenadine or strawberry syrup to taste; stir gently.
Garnish with a lemon wedge, mint, thyme, or an edible flower and serve.
Pitcher option: multiply ingredients, stir with ice in a pitcher, and let guests top with soda to taste.
Notes
Use fresh lemon juice for a bright, clean flavor. Adjust sweetness with grenadine or syrup; add more soda to lighten. Swap vodka for gin or coconut rum for an easy variation. Keep glassware and ingredients cold for the crispest sip.