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Preheat the oven to 350 degrees. Butter a 10x15 inch rimmed baking sheet or jelly roll pan making sure to butter the sides. Line with parchment paper. In a heat safe large bowl (I like a big stainless steal mixing bowl) mix the eggs and the sugar together with a whisk (or in a stand mixer) for a few minutes until the eggs and sugar are fully blended and a light white in color. Sift the cocoa, flour and baking soda into the batter, folding the dry ingredients into the bowl with a rubber spatula until all the ingredients are thoroughly mixed. You don't want to use the whisk anymore and fold gently so that the air stays in the mixture. Spread the batter evenly into the prepared baking sheet.
1. Fill a sauce pot halfway with water, bring to boil 2. Chop up the chocolate into slivers – place in a heat resistant mixing bowl 3. Set the mixing bowl on top of the sauce pan of boiling water (the base of the bowl should not be touching the water) – this is the “bain marie”. Stir the chocolate as it melts over the steam. Once it is melted and shiny, take the bowl off of the sauce pan and give it a good stir with a whisk 4. In a small bowl, melt the butter (in the microwave is fine) 5. In another large bowl, beat the 8 eggs with a whisk until frothy (1 minute)