Remove the oxtails: Once the oxtails have been browned, remove them from the pan and transfer them to the slow cooker. Deglaze the pan: Pour a 1/2 cup of beef broth into the pan.

A 1922 ad for Campbell's Ox Tail Soup extolled the ingredients of the soup. It consisted of a tasty broth, carrots, potatoes, barley, tomatoes, and ox tails, the "very tenderest and finest the ...