Wow. κρεμμύδι is onion? Talk about counterintuitive. This word sounds like "cream", and with the first part about soup, it just seemed so logical!. Anyone would have a mnemonic trick to help me with this one?
I really HATE that Duolingo continually uses this construction. It absolutely is not native to English. "..in it." added at the end of the sentence would be a simple alteration and would be acceptable English. Please consider making this change.