If using fresh strawberries, wash them thoroughly, remove the stems, and cut them into small pieces.
In a cocktail shaker, add the strawberries and muddle them gently to release their juices and flavor.
Pour the white rum and freshly squeezed lime juice into the shaker.
Add the simple syrup to the mix (you can adjust the sweetness by adding more or less syrup).
Fill the shaker with ice cubes.
Shake the mixture vigorously for about 10-15 seconds to chill the drink.
Strain the Strawberry Daiquiri into a chilled cocktail glass.
Garnish with a fresh strawberry or a lime slice.
Serve immediately and enjoy!