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It has an astringent taste and it's very aromatic.
It's like comparing grapefruit to oranges, you either like the grapefruit or you dont.

I personally freeze the juice in ice cube flats, and put one cube in my thermos in which i have warm tea, and at the end of the working day it's starts to ferment and the tea tastes like beer/borsch.

I love grapefruit. I must try some!

Cheers.