Q'parol was a type of food, described as very time-consuming to prepare.

A Pah-wraith possessing Keiko O'Brien prepared q'parol for Miles O'Brien's birthday in 2373, which Captain Sisko rated very high. Jadzia Dax arrived late to the party, yet explained that she knew she couldn't miss it after hearing Keiko would be preparing the dish. (DS9: "The Assignment")

According to the script, this food's name was pronounced as "kuh-PAR-ul". [1]
The Star Trek Encyclopedia (4th ed., vol. 2, p. 192) described this dish as a dinner casserole.
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