All the supermarkets seems to sell the same brands and I have no idea if any of them are mostly processed in Europe or elsewhere in the world.
Do you have recommendations? I like the ones with a fruity taste more.
This one is my current favorite:
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They claim on the package that they care about sustainability, better working conditions and social engagement.
Afaik Sonnentor also has a good financial compensation model for the laborers on the tea plantations they source from.