torlesse put his brain into words:

has anyone heard of a kind od red tea called carcidia (the spelling
may be wrong!)

Do you Carcade, which is not a tea at all, but an red african infusion of
hibiscus flowers? Drunk alone, it is very acid, and most people add at
least sugar.
I recently discovered that Carcarde may also give good results when mixed
with African black tea.