Cajun food was a type of cuisine originating on Earth in the state of Louisiana – specifically New Orleans, known for being very spicy (or "hot"). Gumbo, jambalaya and crawfish étouffée were examples of Cajun food.
Trip Tucker thought Cajun food was hot until he had his first taste of Haljaran in 2151. (ENT: "Oasis")
In an attempt to berate his doctor, who had criticized his lack of care for his health, Joseph Sisko complained that despite the fact that his doctor has been living in New Orleans for twenty years, he still couldn't tell the difference between Cajun food and Creole food. (DS9: "Homefront")