3/4 lb 70% bittersweet chocolate pieces
(please do not make this with nestle or similar chocolate chips--you will not get the result you deserve)
5 large eggs--room temperature
10 1/2 oz granulated sugar
1/2 lb unsalted butter--room temperature
1 tsp vanilla
1/2 cup water
place eggs, 1/3 of sugar, salt and vanilla in the bowl of a stand mixer fitted with the whisk attachment. whisk until the eggs have tripled in volume, and thickened. this will take a minimum of 10 minutes. in the meanwhile, place the remaining sugar in a saucepan with 1/2 cup of water. bring to a boil and let boil for 3 minutes. remove from heat and stir in butter and chocolate...letting them melt completely. allow to cool slightly then slowly pour into the whipped eggs. whisk for 1 minute, if it doesn't fully incorporate in that time, use a spatula and fold to fully incorporate. pour into prepared pan.
* to prepare the pan: use a springform pan and spray with pan spray...and then instead of flour, use cocoa powder to coat the pan, tapping out any excess.
there are two ways to bake this cake
to produce a creamy cake, a bit like pudding. this is in tune with the original recipe. in order to get this result you will need to bake in a water bath (place your prepared pan, wrapped in foil, into a larger pan that will leave a "moat" of no less than 1" on all sides. fill the "moat" with enough hot water to reach halfway up the sides of the prepared pan)--it is best to do this with the cake pans already in the oven, to avoid spilling water all over the kitchen floor and into the cake batter.
place prepared pan into a water bath and bake for approximately 35 minutes at 325. the cake is done when it no longer jiggles, but the center still seems a bit soft. if it begins to pull away from the sides, it is over-cooked. after 30 minutes, place your flat hand on top of the center of the cake, if it is no longer liquid, and looks as if it has a skin similar to that of chocolate pudding, and the cake doesn't jiggle, it is fair to say it is probably done.
option number two is to pour the batter into the prepared pan and bake it in the oven without the water bath at 350 for about 30-40 minutes. the cake will rise considerably, then fall. it will look like a fallen souffle and have a light crispy exterior with a dense chewy interior.