McVitie's has introduced Jaffa Cake-flavored Digestives in an effort to resolve the long-standing argument over whether Jaffa Cakes are biscuits or cakes. These new treats, which blend a Digestive base with a Jaffa Cake-flavored layer, are now available at Sainsbury's for £2.35.

The £2.35 Sainsbury's gamble to end a culinary war

McVitie's is attempting to silence "biscuit believers" by releasing a product that bridges the gap between two warring snack categories. According to the report, these treats combine a standard Digestive biscuit with a layer flavored like a Jaffa Cake and are currently retailing for £2.35 at Sainsbury's. By creating a product that is structurally a biscuit but tastes like a cake, McVitie's hopes to bypass the semantic deadlock that has plagued the brand since it began making Jaffa Cakes in 1927.

The company's strategy suggests that the only way to satisfy the public is to provide a version of the treat that fits both definitions . A spokesperson for McVitie's stated that creating an actual biscuit seemed like the only way forward to set the record straight once and for all .

The 1991 court battle with Her Majesty's Customs and Excise

The distinction between a cake and a biscuit is more than just a dinner-table argument; it has historically carried significant financial implications. As the report notes, McVitie's faced a legal challenge in 1991 from Her Majesty's Customs and Excise, which questioned the company's labeling of Jaffa Cakes as cakes. The court eventually ruled in favor of McVitie's, confirming that for tax purposes, Jaffa Cakes are indeed cakes.

This legal victory protects the product from certain taxes applied to biscuits, proving that the definition of a snack can be a high-stakes corporate matter. The ruling established a precedent that physical properties—such as the fact that Jaffa Cakes harden rather than soften when they go stale—are more indicative of "cake-ness" than where the product is shelved in a store.

How Dr. Héloïse Stevance used AI to classify Jaffa Cakes

Modern science has also attempted to resolve the dispute using machine learning. Dr. Héloïse Stevance, an astrophysicist at the University of Auckland in New Zealand, utilized algorithms to analyze the composition of these treats. By training models on 51 biscuit recipes and 41 cake recipes, Dr. Stevance applied a "random forest" classifier with 95 percent accuracy and a "support vector machine" with 91 percent accuracy.

Both algorithms unambiguously identified Jaffa Cakes as cakes, based on their ingredients and physical properties. Dr. Stevance used recipes from the internet , including one by Mary Berry, to ensure the AI had a representative sample of the product's makeup. the results suggested that, from a data-driven perspective, the debate is already over.

The 'biscuit aisle' paradox and the residue problem

Despite the AI findings, the "host environment" remains a point of contention for many consumers. Dr. Héloïse Stevance observed that while Jaffa Cakes are sold in the biscuit aisle, other products—such as those from Mr Kipling—are also sold there without sparking controversy. This suggests that retail placement is a poor metric for culinary classification.

However, a lingering question remains regarding the actual user experience. Dr. Stevance admitted that Jaffa Cakes can be held and dipped without leaving residue on the fingers, a trait more common to biscuits than sticky cakes. Because the eating experience is so similar to a traditional biscuit, it remains unclear if the public will ever fully accept the scientific and legal definitions over their own sensory observations.