Classic Brownies

5 squares unsweetened chocolate
1/2 cup butter
1/2 cup vegetable shortning
4 eggs
1/4 tsp. salt
2 cups sugar
1 Tbs. vanilla
1 cup flour

Preheat oven to 325 °F. Grease a 9" square pan.  Melt chocolate, butter, and shortening together, over hot water, then let cool.  Beat eggs with salt until light; add sugar gradually, and beat well.  Add chocolate mixture and vanilla, mix well; then add flour and beat until smooth.  Bake 50 minutes.