You can use instant coffee decaffeinated or caffeinated. Along with the chocolate, it will be in charge of giving color and flavor to this rich cake.
This piece of pastry is prepared in no time and with very little effort because in our food processor we will grate the chocolate and mix all the ingredients. After forty minutes in the oven, the cake will be ready ready.
The apple pieces They are optional but they add creaminess. Of course, do not forget to keep it in the refrigerator, especially now that the temperatures begin to be higher.
I leave you the link to a compilation of sponge cakes with fruit that are prepared in Thermomix. I hope it inspires you.
More information - 9 sponge cakes with fresh fruit