My ex-husband dubbed these "Footballs" some years ago. Our son still calls them that. As in, "Oooo! Are we having Footballs?!!" It's from the Complete Encyclopedia of Vegetables and Vegetarian Cooking by Roz Denny & Christine Ingram. The recipes recommends "full-flavored crimini mushrooms", but I always just use button mushrooms. Goes well with Recipe #292756 and mashed potatoes.