Ingredients
Equipment
Method
- Preheat oven to 350°F (175°C). Line a 10x15 inch jelly roll pan with parchment and grease lightly.
- Whip egg whites to soft peaks, slowly add 1/4 cup sugar and whip to stiff peaks. Set aside.
- Beat egg yolks with remaining 1/2 cup sugar until pale. Mix in oil, buttermilk, vinegar, vanilla, and red coloring.
- Sift cake flour, cocoa, baking powder, and salt over the yolk mixture. Fold gently.
- Fold whipped egg whites into the batter in three batches, being careful not to deflate.
- Spread batter into pan and bake for 10-12 minutes until springy.
- Immediately invert hot cake onto a powdered sugar-dusted towel. Peel off parchment and roll cake up tightly in the towel. Let cool completely.
- Mix graham crumbs, sugar, and melted butter. Press into an 8x8 pan and bake for 8 minutes. Cool and cut into rectangles.
- Beat cream cheese and butter until smooth. Add powdered sugar and vanilla, beating until fluffy.
- Unroll cooled cake, spread filling evenly, and tightly re-roll. Chill log wrapped in plastic for at least 2 hours.
- For glaze: Simmer sugar, water, and condensed milk. Remove from heat, stir in bloomed gelatin. Pour over white chocolate, let sit, then whisk smooth.
- Divide glaze, dye one part red and one part white. Cool to 90°F. Swirl white lightly into the red.
- Slice the chilled cake log. Pour swirled glaze over each slice on a wire rack. Top with reserved cake crumbs.
- Transfer glazed slices onto graham cracker bases. Chill until ready to serve.
Notes
Ensure your mirror glaze is exactly 90°F (32°C) before pouring. Too hot and it will melt the frosting and run off; too cold and it will be gloopy and thick.