Occasionally, a new product is discovered after a simple mistake. Just like penicillin was the end result of a messy lab bench, Seltzer's Double-Smoked Sweet Lebanon Bologna came about after an error in a smokehouse.

Stores that used to carry little more than ham, turkey breast and roast beef now include deli specialties like coppa, prosciutto and ‘nduja – European delicacies that have found new popularity in the U.S.