SONIC America€™s Drive-In is the nation€™s largest chain of drive-in restaurants! Serves 3,500+ drive-ins serving ~3M customers everyday. SONIC has an award-winning menu including signature Cherry Limeades and Shakes. Enjoy this simple, easy to make Root Beer Shake pudding at home! SONIC Root Beer Shake Pudding. Fun and easy to make! Enjoy the taste of SONIC Root Beer shakes at home.