(S9 E18) What exactly makes something a casserole? What is a casserole dish? Glad you asked! Rick and Kate are here with the fascinating history and classic versions of this popular dish. Whether it's pasta, grains, or vegetables, you will find out best and easiest way to make this dish. Ever wonder how far back the first documented casserole dish goes? What former president popularized the dish? And what are they called in the midwest? Tune in for all the answers. Also, up for discussion is the first meat dish Rick has made (but did not eat), and a chicken salad that was way tastier than it had a right to be.