Great quiz, I've eaten almost all of these. Didn't realise gai lan was Brassica but it makes sense! Please accept more type-ins for kohlrabi, I had no luck :) Also -- and I know this a terrible thing to suggest -- but you may want to accept "Brussel sprouts" (I know, a geographer dies every time someone types that, but still -- due to elision I didn't realise until now that there was an 's' on Brussels).
Thanks, I appreciate the feedback. Never had gai lan before myself, but I did have kohlrabi for the first time earlier this year. I'll look into adding some more type-ins for kohlrabi and maybe even "Brussel" sprout ;)