Fill cocktail shaker with ice. Add gin, lime juice, and simple syrup.
Shake hard for 15 seconds until very cold.
Strain into a chilled cocktail glass.
Garnish with a lime wheel and herbs if desired.
Notes
Fresh-squeezed lime is best. Adjust sweetness by changing syrup amount. Honey syrup adds a warmer touch. Try different gins or herbal garnishes for variety.