The drink, not the politics
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When you cold steep, do you first rinse the leaves with hot water? I have heard that helps stop bacteria growth (probably something I'm just paranoid about), and might improve the flavor, I've only tried it with no rinse.
I had never heard of that. I'll have to give it a try the next time I brew a batch.
My understanding is you only need to rise in hot (read: boiling) water if the tea has inclusions that are not tea such as fruit or is a fermented tea such as Pu'erh. This is not the case for sun tea which encourages bacteria growth.