Never heard of them.....so they could actually go in the oven too! My BIL makes a mean pizza in the oven with cast iron skillet. Like me he has a few dishes he’s good at, and they are outstanding!
They are what I make my pot roasts in....my stews in....my sauces in....cooked frostings.....custards.....fried cabbage.....on and on :-)
And, yes....they can go in the oven, or on stove top.