For the Lightning McQueen cake, beat eggs with sugar and a pinch of salt for about 10 minutes until foamy, add chocolate milk and oil and stir in briefly on low speed. Sift flour, baking powder and cocoa powder over the mixture and fold in carefully with a spatula.
Spread the dough on a baking tray lined with baking paper, smooth it out and bake at 180 °C for about 20 minutes. Using the ingredient amounts in the note, once again make a chocolate mixture and bake in a small 18 cm diameter cake pan (line the bottom with baking paper).
Turn out onto a clean baking paper and let the baked pieces rest, preferably overnight, so that they can be cut easily. Divide the pie plate and “waist” each half a bit and round off one short side a bit.
Spread the top of one piece with currant jelly and place the second piece on top. Cut the driver’s cab out of the cake pan. Slant the windshield very slightly and run the back window. Cut across once, fill with jelly and then attach to chassis with jelly.
From the leftover strips, glue the rises above the wheels and the rear spoiler, also with jelly. Place the cake in the refrigerator for at least an hour.
For the Swiss Meringue Buttercream, combine egg whites and sugar in a metal bowl. In a suitable saucepan, bring water to a boil and place the bowl on top (be careful not to let the water reach the bowl!).
The mixture