As per Sonic:

“Sonic Cheeseburgers and SuperSONIC Double Cheeseburgers are new and improved! Bite into 100% pure beef, melty American Cheese, chopped Iceberg lettuce, crinkle cut pickles and hand-sliced tomatoes all served on a toasted bakery bun with creamy mayo and ketchup. Hot and melty, just the way you want it!”

You can find the “new and improved” saucy cheeseburgers at …