Combine all ingredients and knead to form soft dough. Refrigerate for two hours.

Divide dough into four parts.

Roll out two parts and place on two 11- by 17-inch cookie sheets. Prick and pre-bake for 15 minutes.

Combine plums with sugars and spread over pre-baked doughs in cookie sheets.

Roll out rest of dough. Cut into half-inch strips and do lattice work over plums.

Bake at 350 degrees Fahrenheit for one hour. Cut into two-inch squares.