Altering flavor after fermentation

[jcs401]

Is there any ways to alter flavors after fermentation has completed? I made a yellow rose clone and fermented at 67 with us-05 and it turned out sort of a sweetness/sort of buttery taste. I did two packets of yeast. It’s not horrible but not something I want to drink 5g worth. Anyway to add anything to help
Just alter it a tad like citrus juice or something or is after fermentation really nothing can be done?

 

[JimRausch]

Buttery? Like movie popcorn fake butter? If so, then it's diacetyl and your fermentation isn't finished. Warm it up, give the fermenter a swirl to get yeast back in suspension and give it another week.
If it's not diacetyl, just too sweet, you can always dryhop with a couple oz. of your favorite hop to counteract the sweetness.
If you want to add something like a citrus juice, then you'll have to do something to stop the yeast from fermenting the sugars. And that is a whole 'nother topic.