Make the simple syrup. Bring the water and sugar to a boil. Boil for 3 minutes making sure all the sugar has melted. Set aside to cool.
Using a wedge of lime, rub the rim of rocks or margarita glasses with the lime. Dip the edge of the glass into the salt. Fill 1/2 way with ice.
Muddle the raspberries with the lime juice in a cocktail shaker.
Add the tequila and simple syrup. Fill with ice. Shake until well combined. Strain into the prepared glasses. Garnish with lime wedges and more fresh raspberries.