"Trash Panda — We're honored you're such a big Pebbles fan!" the handwritten note began. "We hope you enjoy the custom gift at the bottom of the box.

Owner of Trash Panda Vegan in Phoenix received a cease-and-desist letter from Panda Express. And she's not the first. What's behind the legal action.

PHOENIX (3TV/CBS 5) - Panda Express is in a legal battle with a Valley food truck and restaurant called “Trash Panda Vegan.” This isn’t the first time this has happened here in Arizona.