PENNSYLVANIA DUTCH SOUR CHERRY PIE

1 qt. fresh sour cherries

1½ cups sugar

½ cup flour

pie crust

Mix flour and sugar and pitted cherries in a bowl. Fill unbaked pie crust with the cherries. Put on a top pie crust, vented and bake in a hot oven for 10 minutes. Reduce to moderate and bake for 20 minutes more.