literally every precooked food has poison in it unless you are buying maybe some pirashkis or whatever babushka baked for sale at the russian store. you can also get ryazhenka which is like a cooked kefir, tastes better in my opinion, but the more processed you go even with goods imported straight from russia there might be canola oil, palm oil, or sugar substitute(noticed the chernogolovka sodas recently changed to have fake sugar and now taste like diet crap sadly.)
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