Pflaumenkuchen (Plum Cake)
Make a dough from the first 6 ingredients, press into cookie sheet with your fingers, forming a rim.
Spread thin layer of peach or apricot jam on top of dough.
Now put your plums (which have been quartered) in rows on the dough.
Beat egg whites slightly and brush over plums, sprinkle two tablespoons of flour over egg whites.
Bake at 375℉ (190℃) F for 40 minutes.
If too sour shake some powdered sugar on top.
This can also be made in the winter substituting apples for the plums.