Mamma Daisy's Fallen Cake

This was my grandmother's recipe. I found it in my mother's recipe box, which came to me after she passed away. I've never made it. I'm not sure if the margarine is essential to the recipe turning out right. I think I'll try it with butter and see what happens. The recipe card didn't specify what size pan to use, but I seem to recall my mother baking it in a fairly large cast iron skillet.