Add eggs and 10g of sugar to a bowl, briskly whip, add cake flour and cocoa, and mix with a spatula or spoon taking care not to squash the bubbles.
Cut a 1 liter milk carton in half.
Add Step 1 into 2 (the carton), wrap with plastic wrap, and microwave at 600W for 40 seconds.
Take out Step 3, cut into 1 cm slices, and cut off 5 mm around the edges of the cake so that it is slightly smaller than the milk carton, and put it back into the carton.
Mix the peaches with up to 12 g of sugar with a mixer.
Transfer to a bowl.
Dissolve the gelatin in 24 g of hot water, mix with Step 5, pour cold water into the bottom, and mix while cooling until it thickens.
Whip the heavy cream in Step 6 until it is almost stiff, pour it over Step 4, and let it cool/solidify in the fridge.
Cut the four corners of the milk pack with scissors, flip it over to a plate, and cut into your desired portion sizes.