1 hour ago, kayb said:I didn't think there was any way to season cast iron except with bacon grease. At least that's all I ever knew to be used when I was a kid.
For many years I used lard (home rendered) and it worked great for me.
However, for the past couple of decades I have friends who are Muslim, Jewish or vegan and out of respect for them, totally cleaned my cast iron and re-seasoned them with oils that have a vegetable base. Except for my antique griddle, which I still grease with bacon skin - one of the reasons I buy slab bacon from time to time.
That griddle has a surface that looks like black porcelain. And I only use it for my own food.