1. Coat the top of a rocks glass with lime juice and then dip in plate filled with salt. Set aside.
  2. Add the tequila, lime juice, grand marnier, and agave syrup into a shaker filled with ice.
  3. Shake vigorously.
  4. Fill the rimmed rocks glasses with ice and strain the cocktail into the glasses.
  5. Note: if you are batching the cocktail, simply multiply the measurements above by the amount of drinks you are making. Put the combined ingredients into a pitcher and then place in the fridge.