[10] In May 2023, Mazzei collaborated with Corinthia Palace in Malta to serve Italian cuisine in the hotel.

[6] In February 2025, Francesco Mazzei collaborated with actor Stanley Tucci to design a menu for a black-tie dinner hosted by King Charles III at Highgrove House.

The event celebrated Anglo-Italian relations and the Slow Food movement, emphasising sustainability and quality in gastronomy.

Mazzei crafted an Italian-inspired menu using predominantly British ingredients, such as Yorkshire-made pecorino and Scottish crab, while the only Italian import was Farchioni olive oil.

"[12] Mazzei’s participation in the event was widely covered in the media, with reports highlighting his commitment to sustainable cooking and his influence on British-Italian culinary fusion.