2 cups fresh lime juice, plus lime slices, for garnish
1 1/2 cups orange liqueur
1/4 cup agave syrup
For the rim: Moisten the rim of the glasses with lime wedges and dip in the salt.
For the margarita: Combine the tequila, lime juice, orange liqueur and agave syrup in a large pitcher. Stir vigorously to combine. Pour over ice in the salt-rimmed glasses, garnish with a slice of lime and serve immediately.