1 lb Walnut halves or large
Pieces
1 1/4 c  Unsifted cocoa powder
1 1/4 c  Unsifted all-purpose flour
1/2 ts Salt
12 oz Unsalted butter (3 sticks)
3 c  Granulated sugar
7 lg Eggs
2 ts Vanilla extract

Adjust a rack one-third up from the bottom of the oven and preheat to
350 degrees. Line a 13 X 9 X 2-inch pan with foil (turn pan upside
down and mold foil to the pan, including up–down?–the sides, turn
pan over and fit foil tightly into pan. Take a piece of butter, place
it in the pan (on the foil), and place in the oven only until the
butter is melted. Then, with crumpled wax paper, spread the butter
all over the foil and set the pan aside.

Sift together into a large bowl the cocoa, flour and salt and set
aside.

In a 3-quart heavy pan over low heat, melt the butter. Remove the
pan from the heat and stir in the sugar, then the eggs two or three
at a time, and then the vanilla. Add the butter mixture to the sifted
dry ingredients, pouring it in all at once. Beat on low speed (of a
mixer) or by hand, scraping the bowl as necessary, until ingredients
are completely mixed. Stir in the walnuts.

Turn the mixture into the prepared pan and bake for 50 to 60 minutes
until a toothpick gently inserted in the middle comes out clean, but
with a bit of chocolate clinging to it. Do not overbake or they will
be dry.

Cool in the pan at room temperature. When the bottom of the pan is
just tepid, cover the pan with a length of wax paper and then with a
flat cookie sheet or board. Turn the pan and the sheet over, then
remove the pan and slowly peel off the foil.

Leave the cake upside down and transfer to the refrigerator overnight.
Cover the chilled cake with a cookie sheet or board and turn it over
again, leaving the cake right side up. Remove the sheet and wax
paper from the top of the cake. Using a long, strong sharp knife, cut
the cake into 24 extra-large brownies (or smaller if you prefer).

These are, supposedly, Maida Heatters favorite brownies, the
creation of Cristina Guiovanoli, then a student at the Culinary
Institute of America

These are very rich, obviously, and absolutely delicious.