Vanilla beans and their derivatives are commonly used in many dishes as a spice.
The whole beans are available for purchase in stores and online. I understand that plain fruits and vegetables (when there is no concern of Israeli produce, as is the case here TTBOMK) generally do not need certification to ensure their Kashrut (though they may need to be cleaned well).
I see though that whole vanilla beans are often described as "cured" (eg. here or here or here). I don't know what exactly this process entails, and I wouldn't be surprised if there is some variation in the process among different growers and distributors.
I tried searching the internet for discussion of the need for certification of the Kashrut of vanilla beans, but only found discussions relating to vanilla extract, a product with a more involved manufacturing process involving alcohol where a certification of Kashrut seems appropriate.
Have any modern rabbis or recognized Kashrut certification agencies commented about the acceptability of uncertified whole vanilla beans, both in general and particularly as regards "cured" beans?
(This seller says "Vanilla beans, an agricultural product, are Generally Recognized as Kosher (GRAK) and need no Kosher certification." I'm looking for a more authoritative and trustworthy source than a (non-Jewish) manufacturer of the product in question.)