I like marinading light fish, like tilapia, flounder, ect. in buttermilk for about 30 minutes before preparation...
I ususlla add S&P and a little bit of cayenne to the buttermilk...
and we usually fry fish in this category...
bread crumbs or cracker meal or cornflake crumbs...
and now I usually will add powdered buttermilk to the coating! plus whatever spices I feel like at the time... Yummmm...