PARIS, France—While window-shopping one late night on the Rue St. Paul, a bottle of Tabasco sauce stopped me short.

The store was called, simply, if inexplicably, Thanksgiv-ing. The establishment had subtitles, including “Cuisine de Louisiane,” which brought me back the next day during regular hours to ask questions.

Proprietor Judith Bluysen was chatting in English with a regular customer when I arrived. Her market specializes in American groceries that ex-pats might miss while living in Paris, everything from marshmallow cream to Fruit Loops. Even in the land of haute...

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