Preheat oven to 350°F.
Place 1 ounce flour, 1 ounce cornstarch, 6 ounces sugar, 3 whole eggs and 6 egg yolks in a stainless-steel bowl, mixing well with whip to dissolve any lumps. Set aside.
Place half-and-half into a sauce pot. Place over medium high heat and bring to a boil.
Slowly add the hot half-and-half to the egg mixture, stirring constantly.
Once combined, return mixture to the sauce pot and place back on stove. Cook on stovetop stirring constantly and bring to a boil again. Remove from heat.
In a separate bowl combine chocolate and 6 egg yolks.
Slowly add hot cream mixture to the chocolate and yolks, continue stirring until the chocolate is completely melted and mixture is smooth.
Cool mixture to approximately 120°F before proceeding.
Place 12 ounces egg whites and 2 ounces sugar in mixing bowl. Beat at medium speed 5 - 7 minutes until stiff peaks form, being careful not to over mix.
Fold whipped egg whites into chocolate mixture in 2 parts - Half of the mixture to loosen/lighten the base, and the remaining gently fold in lightly making sure to incorporate well.
With a pastry brush, coat soufflé dish with whole butter.
Place 1 tablespoon sugar in soufflé dish, coat and discard excess sugar.
Ladle soufflé mix into baking dish, gently tapping dish on hard surface to remove excess air pockets.
Place in preheated oven and bake 15 - 16 minutes or until done.
Serve hot.