1/2 oz fresh lime juice
1/2 oz simple syrup
Place all ingredients into shaker with 1.5 cups of ice. Shake 30 seconds (totally underrated and makes the cocktail), pour into a glass. Garnish with a lime or orange slice.
Rub rim of glass with lime wedge and salt the rim.
If you want to lighten it up and make it go further, add club soda.