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1
Place the eggs, sugar, salt, and olive oil in a mixing bowl and beat with a fork until the sugar is dissolved. Set aside. (Using a fork instead of a whisk or electric beaters will minimize the amount of air incorporated into the batter, giving you denser and fudgier brownies. The dissolved sugar that binds with the egg forms a skin as it dries during the beginning stages of baking - similar to the smooth shell of macarons.)
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2
In a small saucepot, melt the butter over medium low heat, swirling occasionally. As soon as the butter is melted, add all of the chocolate and turn off the heat. Let the mixture sit for 30 seconds, then stir gently for about 2 minutes until the chocolate is completely melted and the mixture is smooth. (Butter melts at 35u00b0C, and chocolate melts at 30u00b0C. Since the eggs only coagulate at around 60u00b0C, you should have no problem combining the two directly.)
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3
Pour all of the chocolate mixture into the egg mixture and mix with a fork until smooth and shiny. Add all of the buckwheat flour and fold it in gently with a fork, making sure you get rid of any lumps. (The finished batter should be smooth, shiny, and considerably runny for a brownie. Don't worry, it only seems very runny because it has tons of melted fat and un-coagulated protein.)
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4
Line an 8-by-8 inch square baking pan with parchment extending up the sides and pour in the batter. Tap it firmly against your counter for 5-7 times to get rid of any air bubbles. (Air bubbles will rise to the surface during baking and break the craggly skin you want.)
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5
Allow the mixture to rest for 20-30 minutes as you preheat the oven to 325u00b0F, placing the rack slightly above the middle of the oven. (Most recipes will give 350u00b0F as the temperature setting, but the same ingredient transformations such as proteins denaturing, sugars rearranging, and starches gelatinizing can all happen at a lower temperature. In addition, the low temperature ensures that the cooking is more even since heat travels through mediums at a constant speed regardless of the difference between the surrounding temperature and the medium's temperature, and a slower and lesser rise which will not disturb the delicate wafer-thin skin that forms at the top nor turn the brownie cake-y.)
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6
Bake for 28-30 minutes, or until the middle is puffed up, shiny, but still jiggles when you shake it gently. (The middle only puffs up because the moisture there is heated through, becoming steam which rises, but it is still wobbly which means that the starches haven't completely expanded and set up. In other words, it's cooked but not over-baked.)
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7
Place directly on the counter and cool to room temperature. If you would like, now is the time to sprinkle on some fleur de sel - while it's hot and still giving off steam so it sticks. (You want to cool the brownie down as quickly as possible so that the center stops cooking immediately, contracts back down, and turns the smooth shiny skin into the craggle-top. Air is a poor conductor of heat, so cooling it on a rack is about as ineffective as you can do. If you have a marble countertop that is the best way to go.)
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8
Chill completely in the refrigerator, uncovered, for about 2 hours. Once chilled, lift the brownie slab from the pan by holding the extended sides of parchment. Cut into 4, 6, 8, 9, 12, or 16 slices - whatever you fancy. I like to cut them into 6 pieces, makes the perfect breakfast size for me. (Chilling the brownies before slicing solidifies the butter and chocolate fats, giving you cleaner edges.)
