It was created by my great great grandmother back in the days when you put your milk jugs under trees until the milkman came to pick them up. Whatever was sour by the time he got there was returned and she came up with a way to use the sour milk other than for biscuits and the like. My grandma watched her make it and wrote it down. It is a family favorite. Light,fluffy cake that can be used in place of shortcake, for those strawberry shortcake lovers out there! We make this all the time in my family.
Bake in the 9x13 pan you melted the margarine in until JUST THE EDGES of the cake are a golden brown. It is cooked all the way through this way, if you let it bake longer it isn't the nice, moist, fluffy cake it is meant to be.
NOTE : The batter will vary in consistency with this recipe, usually depends on what brand of flour you use or what brand of margarine you use but NEVER put more flour in to thicken it. No matter the end result of consistency, it is just fine as it is.