Has anyone heard of/tried tereré, which is mate brewed with cold lemonade?
Hmm.. I've always understood tereré to just be a small bit of yerba thrown into a pitcher of water.
I do this with a teaball of yerba thrown into a pitcher back home. I drink an average of one small pitcher a day.
But I Googled it just now and this Wiki article does mention lemongrass and citrus juices:
I was unaware of this. Might be worth a try..