LiberTeas is awesome and sent me a sample of this tea. It’s a really interesting tea. I can definitely see where they’re getting the buttery flavor. sssSSSMMMOOOTH!!! Nice and creamy and smooth. It gets vegetal, as TeaEqualsBliss noted, after the butter, but not in a buttered greens kind of way, but more of an aromatic vegetial thing.
I need to play with this more, because the overall flavor of the tea is a little weak. I need to let it steep longer, maybe the second infusion. But I like it.