Add the tequila, orange liqueur, lime juice, and simple syrup to a large pitcher.
Stir well until combined.
Fill the pitcher with ice or refrigerate until chilled.
If desired, rim glasses with lime juice and coarse salt.
Pour margaritas over ice and garnish with lime slices before serving.
Recipe Notes
Fresh lime juice gives the best flavor.
Adjust sweetness by adding more or less simple syrup.
Chill ingredients ahead of time to keep drinks cold without watering them down.
For a frozen version, blend with ice until smooth.