The Orrville, Ohio–based food company J.M. Smucker Co. has filed a federal lawsuit against grocery chain Trader Joe’s, claiming the store’s new frozen “Crustless Peanut Butter & Strawberry Jam Sandwiches” are too similar to Smucker’s own Uncrustables.

According to court filings, Smucker’s alleges that Trader Joe’s copied several distinctive elements of its Uncrustables brand — including the round sandwich shape, crimped “pie-like” edges and packaging design. The complaint argues that Trader Joe’s product could cause consumer confusion due to its similar look, especially the packaging, which also features blue lettering and an image of a sandwich with a bite taken out.

Smucker’s is asking the court to require Trader Joe’s to stop selling the sandwiches, destroy the packaging and turn over all profits from sales of the product.

Although Smucker’s once held a patent for its sealed sandwich-making process, portions of that patent were later invalidated. The company, however, still holds trademarks for its product’s design and packaging, which it claims remain protected under intellectual property law.

This is not Smucker’s first time defending its PB&J turf. In the early 2000s, the company sent legal threats to a Minnesota business called Albie’s Foods, which also produced crustless peanut butter and jelly sandwiches. Though that case never reached trial, Smucker’s demonstrated its determination to protect its signature product.

Trader Joe’s has not publicly commented on the lawsuit, which remains pending in federal court. The outcome will determine whether the grocery chain went too far in replicating Smucker’s design or whether sandwich packaging can truly be owned.

For now, the iconic round PB&J has found itself at the center of a courtroom showdown, proving that even a childhood lunchbox staple can spark a high-stakes legal battle.