Knuckle Sandwiches, a restaurant that has served sub-style sandwiches and fries for 11 years at 1149 Broad St., is not an average sandwich shop. The evidence is in its name.

Owner and chef Joshua Detchemendy gleaned the name for his gourmet sandwich shop from an expression his father, a boxer while serving in the Navy, used: “I am going to give you a knuckle sandwich.”

He said he also hear...