Steps
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Preheat the oven to 350 degrees F. Line a rimmed sheet pan (about 10 by 15 inches) with parchment paper and grease it lightly with coconut oil. Whisk the egg yolks with coconut sugar and vanilla in a large bowl until thick and pale, about 2 minutes. Sift in the cacao powder, tapioca starch, and salt, then fold until just combined.
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In a separate clean bowl, beat the egg whites with an electric mixer until stiff peaks form. Fold one-third of the whites into the chocolate batter to lighten it, then gently fold in the remaining whites in two additions, preserving as much air as possible.
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Spread the batter evenly onto the prepared sheet pan. Bake for 10 to 12 minutes until the cake springs back when touched and the surface looks dry. While the cake is still hot, invert it onto a clean tea towel dusted with cacao powder. Peel off the parchment and roll the cake up tightly in the towel starting from a short side. Let it cool completely in the rolled position, about 20 minutes.
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While the cake cools, whip the cold heavy cream with 1 tablespoon of maple syrup until firm peaks form. Keep refrigerated. Melt the dark chocolate with coconut oil and the remaining 1 tablespoon of maple syrup in a double boiler or microwave, stirring until smooth. Let the ganache cool to room temperature.
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Carefully unroll the cooled cake. Spread the whipped cream evenly over the surface, leaving a half-inch border on all sides. Re-roll the cake tightly without the towel. Use a sharp knife to trim the uneven ends, then cut the log into 8 equal pieces.
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Place the rolls seam-side down on a wire rack set over parchment paper. Spoon or drizzle the chocolate ganache over each roll, covering the top and sides. Refrigerate for 15 minutes until the coating is set before serving.
Why It Works
Separating the eggs and whipping the whites to stiff peaks creates a naturally leavened cake that is thin enough to roll without cracking, yet moist enough to hold together around the filling. Raw cacao powder provides deep chocolate flavor along with flavonoids and magnesium that processed cocoa lacks. The grass-fed cream filling contributes fat-soluble vitamins A and K2, while the dark chocolate ganache coating sets up firm at fridge temperature thanks to the high cacao butter content. Commercial versions rely on corn syrup, palm oil, and artificial flavors for a similar effect, but this approach delivers real chocolate flavor with actual nutritional value.
Tips
- Roll while hot. If you wait for the cake to cool before the first roll, it will crack. Rolling it warm with the towel trains the shape so it stays flexible.
- Sharp knife, clean cuts. Dip a long knife in hot water and wipe it dry between each cut for neat, professional-looking rolls.
- Dairy-free option. Replace the heavy cream with chilled full-fat coconut cream and whip it the same way. The ganache is already dairy-free if you use dairy-free dark chocolate.
- Make ahead. Assemble and coat the rolls, then freeze on a sheet pan. Once solid, wrap individually in parchment and store in a freezer bag for up to one month.
