I recall you saying that having pizza cooked in a non-kosher pizza store is fine, because even if non-kosher meat is being cooked in the same oven, that taste won’t go onto my kosher vegertarian slice of pizza. To my understanding this would fall under Notem Tam Lifgam (giving a bad taste).

I’ve also heard you mention the idea that the Oven is kashering itself.

So can I cook food in a non-kosher oven since the taste won’t go into the food I’m cooking, or do I need to still kasher the oven?

I guess I’m a bit confused about this.

Can you explain both of those principles more in depth?