Jewish Delis Have One Unspoken Rule Most Other Delis Don't - Tasting Table

"Why no customizations? It's quite simple, really. Jewish deli sandwiches are, in essence, a work of art. Between the double-baked rye bread, massive layers of cold cuts, slather of mustard, and sometimes even cheese - if the deli is not kosher - these sandwiches are intricately engineered to give you the best bite every time. For example, to request white bread in lieu of rye, mayo in lieu of mustard, or any other similar customizations would be a downright shanda (shame)."

"Depending on the specific deli and location, some might be more willing to accommodate special requests than others. With that said, expect your substitution request to be refused if it isn't within reason. Outside of dietary restrictions and allergy concerns, a Jewish deli sandwich is meant to be enjoyed as-is, no more, no less. Of the many mistakes to avoid when dining at a Jewish deli, putzing around with tradition is enough to warrant an "oy vey!""

Jewish deli sandwiches are crafted to deliver a specific bite through elements like double-baked rye, thick cold-cut layers, mustard, and occasional cheese. Substituting bread, condiments, or other components alters the intended flavor balance and can be seen as disrespectful to tradition. Some delis may accept reasonable requests, but many will refuse nonessential customizations. Dietary restrictions and allergies are valid exceptions. Sharing plates with companions allows sampling more menu items and enhances the communal deli experience. Preserving sandwich composition helps maintain cultural and culinary authenticity.

Read at Tasting Table