You might have already found the recipe, but I thought I'd post this from a site I found online:
[url= By Jalane Farrington – 20th July 2014 News, PC Games, PS4/1 Comment Garden Tip: Thavnairian Onions in FFXIV Since the update of the 2.3 patch, Final Fantasy XIV provides more options into raising the iconic yellow companions known as chocobos, but these feisty pet birds require an enormous amount of work to groom and maintain until they reached their maximum level. Besides training these animals and cleaning their dirty stables, the new guardians might not realize the most agonizing requirement above all: time. Numerous days and hours are spent into cross-breeding and growing selected vegetables to feed chocobos, but the most demanding item is the Thavnairian Onion and its seeds.
Unlike other foods or crops that may raise minor attributes, this magical onion actually increases the chocobo’s level by one but does not exceed above the 20 maximum capacity. As such, finding these rare treats has rapidly become more problematic after the recent update, resulting in the dramatic shift in marketing. Owners of these products will sell these items at an outrageous, expensive price. Because online users either cannot afford or do not care to spend their money in the growing market, private companies or hardworking individuals turn to an alter direction.
During these summer days in the virtual world, several botanists and others search for the perfect formula and ingredients to create this special but rare object through the trail-and-error method in gardening. Sometimes, the farming yields surprising results, including creative tities like the Eggplant Knight, etc., but these findings also turn into frustration when reports provided false rumors. Despite this miserable waiting and annoying end results, someone with enough patience, seeds, and fertilizer has found the correct combination to retrieve a bag of this vegetable.
For those who finally wish to know this needed recipe, please cross-breed either (Sylkis Bud or Royal Kukuru) and Broombush in grade 3 Thanalan soil to acquire a Thavnairian Onion bag. For detail seekers who want an actual confirmation, I cannot provide the original source due to secrecy from an informer, but the results should make people smile and end this overwhelming desire and challenge.
Also, don’t forget to ask friends to join and help since Final FantasyXIV will be free for this whole weekend!
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Woahwoahwoahwoahwoah, woah...you're a level 28 Conjurer?! Now I feel sorry for dragging you into Titan HM like that. (I'm just kidding, of course. lol)
As for the Thav Onion: its becoming more "known", but it's also still "chance". I believe the higher combinations have two possible cross-breeds (or more), as a way of thwarting people from just mass-producing Thavnarian Onions.
If I had more time (and more gil) though, I'd give it a try...
"When men run out of words, they reach for their swords." "Let's hope we can keep them talking."