「オススメは？」（おすすめわ）[oh-su-su-meh-wah?] "What is the recommendation? What would you recommend?" It's an easy expression to remember, o-su-su-me-wa? And it literally means "Regarding the recommendation, what is it?" The verb "to recommend" is すすめる。 Adding the "oh" in front makes it an elevated (respect-level) term and the dropping of "ru" morphs it into a noun.