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I thought you'd know hibiscus. It's so beautiful when you add water to it. I think sorrel is more sour than hibiscus. It can be sweet, yes, now that I think of it. I like to make iced herbal tea (minus sugar) with either, but I typically blend each of them with other herbs.

Yeah, I am making ice tea with it.
tbh I prefer my tea as hot as a lava, but now is hot even in UK, so little bit of ice helps a lot:)

Ha, you're also an ice tea person! I grew up on tea, English style, fine china cups and the like (don't tell anyone). I prefer it hot also, even if it's hot weather. Ice tea is a sometimes thing when the mood strikes me to do so.