Turn your oven on to 375°F right now—don't wait. Ovens need 15-20 minutes to reach full temperature, and you want the oven hot and ready when your batter is ready. While the oven preheats, take your 9-inch round cake pan and brush the bottom and sides lightly with refined coconut oil. I use about ½ teaspoon total, applied with a folded paper towel or clean fingers. Then tear a piece of parchment paper about 6 inches square and press it into the bottom of the pan, smoothing out air bubbles. The oil acts like glue, holding the parchment in place. This step eliminates 90% of demolition cakes, so I'm very serious about it.

Take your 7 ounces of bittersweet chocolate and chop it into pieces roughly the size of your pinky fingernail. Smaller pieces melt faster and more evenly, which prevents overheating. Place the chopped chocolate and ¾ cup of coconut oil (at room temperature—this is important because cold oil will cool down hot chocolate and make it thick) into a large microwave-safe bowl. Don't start melting yet; just get everything staged and ready. Having ingredients prepped before you start microwave melting prevents scrambling when heat is involved.

Microwave the chocolate-oil mixture in 30-second intervals, stirring thoroughly after each burst. This gradual approach prevents chocolate from seizing or becoming grainy. After the first 30 seconds, stir for about 10 seconds, then microwave for another 30 seconds. Continue until the mixture is completely smooth and shiny, with no visible chocolate chunks remaining. This usually takes 60-90 seconds total, depending on your microwave's power. When it's done, the mixture should look glossy and pourable—like warm chocolate pudding. The chocolate should feel warm to your touch, not hot. If it's steaming hot, let it cool for 30 seconds before moving to the next step, because you're about to add raw eggs, and you don't want them to scramble.

Pour 1⅓ cups of sugar into the warm chocolate mixture and stir well for about 30 seconds. The sugar should distribute evenly throughout, and the mixture will become slightly thicker and lighter in color—almost like chocolate frosting. This is your creaming step without a mixer. Don't worry about achieving volume; you're simply distributing the sugar throughout so it dissolves evenly. Stir until no visible sugar grains remain.

This step is crucial, so I'm going to be very specific. Crack one room-temperature egg into the chocolate mixture and stir vigorously for about 30 seconds. The batter will look jiggly, almost like it's not blending—this is exactly right. The egg will eventually incorporate, creating a slightly thicker mixture. Once the first egg is mostly integrated (small streaks are fine), crack in the second egg and repeat. Continue this process with all five eggs, one at a time. Each egg should be mostly incorporated before adding the next, though you don't need a perfectly smooth mixture between additions. After all five eggs are in, you'll have a batter that resembles thick, creamy pudding or mousse. This batter should jiggle slightly when you shake the bowl and pour slowly from a spoon. If it looks thin and runny like regular cake batter, something went wrong; if it looks thick and chunky, keep stirring—eggs sometimes take a moment to fully incorporate.

Sift 1 tablespoon of unsweetened cocoa powder directly into the batter (sifting prevents lumps). Add ½ teaspoon of pure vanilla extract (optional but wonderful) and ¼ teaspoon of espresso powder if you have it (also optional but transforms the chocolate flavor). Stir everything together gently until the cocoa powder completely disappears and the batter is uniform in color. This should take about 1 minute of stirring. The batter should now look like rich, thick chocolate mousse—no streaks of cocoa powder visible anywhere.

Carefully pour the batter into your prepared cake pan, using a spatula to scrape out every last bit into the bowl (this batter doesn't waste easily). Smooth the top gently with the spatula—you're aiming for a roughly even surface, not a perfectly smooth one. Some rustic texture on top is beautiful. The batter should fill the pan about three-quarters of the way full.

Before the cake goes into the oven, sprinkle the top evenly with ¼ teaspoon of coarse sea salt (like Maldon). The salt crystals sit on top of the cake, and as it bakes, they create little pockets of salty-sweet flavor that make people stop mid-bite and ask what makes your cake taste so special. It's the secret weapon. Place the pan in your preheated 375°F oven and set a timer for 25 minutes. Check the cake at 25 minutes by looking at the top—it should be crackly and set-looking, and when you gently shake the pan side-to-side, the center should jiggle just slightly, like Jell-O. If the entire cake jiggles like it's liquid inside, bake for another 2-3 minutes and check again. If you smell chocolate burning at any point, reduce your oven temperature to 350°F immediately—your oven runs hot, which is fixable next time. The cake is done when the edges look set and firm, the top is visibly crackled, and the very center has just a slight wobble.

Remove the cake from the oven and place it on a heat-safe surface or cooling rack. Let it sit in the pan for exactly 10 minutes—no more, no less. During these 10 minutes, the cake continues setting slightly, which makes it easier to turn out. After 10 minutes, run a thin knife around the edges of the cake to loosen it from the pan, then place a plate upside-down over the top of the pan. Holding the plate and pan together firmly, flip the cake onto the plate. You should hear a soft release sound. Carefully remove the pan and peel away the parchment paper. Now place another plate (clean side up) on top of the cake and flip it again so the beautiful crackly top is facing upward. This flip protects the delicate cake from breaking while also creating that stunning crackled presentation. Let the cake cool completely at room temperature for at least 1 hour before slicing. As it cools, you'll notice it deflates slightly and firms up—this is the magic happening. The interior continues setting into that silky, fudgy texture that makes this cake irresistible.