Ganache, you need to prepare the day before.
Heat the cream and pour it over the sliced chocolate, and after a minute, mix until smooth. Cover with plastic wrap and refrigerate.
Mix flour with starch and sift.
Beat egg and white lightly with a whisk and add sugar, then beat lightly again.
Put a container with egg and sugar in a container with very hot water and constantly stirring, let the egg mixture heat up to 40 " C. Remove from hot water and beat with a mixer until a stable foam and until the mixture cools down and greatly increases in volume.
Add the flour and mix very well. The photo shows that the flour is kept on the surface. so the eggs are beaten correctly.
Spread the dough on a 15x22 cm baking sheet covered with baking paper and bake in a preheated 170"C oven for 8-10 minutes.
Focus on your oven!
Cool on a wire rack.
Remove the paper and spread a thin layer of jam. I have mashed strawberry puree 50 g, which I saddened with 6 g of gelfix, adding it to the puree and boil after boiling for 2 minutes.
Very tightly roll into a roll. Wrap it in paper and foil and put it in the freezer for 1 hour.
The roll should be thin and small in size.
Sift together the flour, baking powder and cocoa.
Beat the soft butter with sugar to a cream state, without ceasing to beat, add one egg at a time.
In two steps, enter the flour mixture, stirring with a spatula. At the end, add the milk and...
... mix very well.
Cover the form with 8x15 cm baking paper, I will give at the end a link on how to do it correctly.
Cut the roll at the edges, so that its size is slightly shorter than the size of the form.
Lay a little less than half of the dough on the bottom. Place the roll on top.
Sorry, the photo of this step didn't work out...
And close it with the remaining test.
Bake in a preheated 180"C oven for 40 minutes. Focus on your oven!
Ready to cool the cake on the grill.
Beat the ganache with a mixer. Decorate a cupcake with it.
I also decorated with small meringues, meringue crumbs, strawberry candies and sprinkled with strawberry powder.