According to the Examiner, below is the recipe for the original brownie:

Ingredients

1 lb. 2 oz. semi-sweet chocolate
1 lb. butter
1. lb. 8 oz. granulated sugar
8 oz. cake flour
1 tablespoon baking powder
4 eggs
1 lb. crushed walnuts
1 cup water
1 cup apricot preserves
1 teaspoon unflavored gelatin

1. Melt chocolate with butter in a double boiler.
2. Mix sugar, flour, baking power in a bowl
3. Mix chocolate/butter combo with dry ingredients for 4 to 5 minutes
4. Mix in eggs
5. Pour batter into a 9 x12 inch baking pan. Sprinkle and press walnuts on top.
6. Bake in oven at 300 degrees for 30 to 40 minutes
7. Brownie will be ready when edges are crispy but middle is still gooey.
8. Remove tray from oven and allow brownie to cool for about 30 minutes.
9. While brownie cools mix water, preserves and gelatin in a saucepan and let mixture boil for two minutes.
10. Pour hot glaze over cool brownies.
11. Place in freezer for 3-4 hours then cut into portions.