hors-d'œuvre

appetizer, starter, hors d'oeuvre (small, light, and usually savory first course in a meal); extension, appurtenance (room of a building that is not part of the main structure); digression (act of straying from the main subject that could be removed from the text without detriment to the main plot); addendum, extraneity, superfluity, accessory, hors-d'oeuvre (something additional or secondary to the main thing)

From hors de + œuvre, literally “apart from the work”, that is, "apart from the main meal"

stand-alone (standing apart from the main body of a building); off-topic, digressive (not relating directly to the subject at hand)

From hors de + œuvre, literally “apart from the work”, that is, "apart from the main meal"