Some recipes are locked away in safes, guarded as fiercely as any family heirloom.
At a small Italian deli in Missouri, the secret formula for its signature hot salami has been passed down through four generations, scribbled in red ink on a piece of paper that now rests in a safe.
The original owners were Northern Italian immigrants who opened the shop in 1918, and the same recipe and techniques have been used to make the salami for well over a century…