Natural speed, please. Try to pronounce properly and avoid noise in the background.
I used to watch Granny cooking, and right from when I was five years old I was allowed to season the soups, test the potatoes, and so on. One year for my birthday, she bought me a cookbook. It was just like Granny talking; all the recipes were simple, economical and linked with little stories, useful advice and amusing sketches. I treasured it, but gradually it fell to bits from overuse, my tastes changed and, finally, I threw it out.
Now, of course, I wish I'd hung on to it despite its sad taste and despite the fact that all the advice would be out of date.