Whole grain, sugarfree and still delicious

I have been thinking about baking a whole grain sponge cake, I wasn't even sure that it was possible, but I gathered confidence and finally made it. The outcome was shocking; whole grain flour behaves the same as plain flour. It didn't collapse and it didn't become heavy, it didn't even have such different taste. According to my sources at home, it was "top notch".

Ingredients for approx. 12 pieces:

• 18 dkgs of whole grain flour
• 6-7 cold eggs according to size
• 10 dkgs of sugar

• 1 can of plain greek yoghurt
• 1 can of plain yoghurt, normal
• 10 gr of gelatine
• zest of 1 lemon and some of its juice
• sweetener according to taste
• a bit of grated cinnamon
• a bit of vanilla aroma or extract
• one can of peaches or any other fruit

Separate the cold eggs and beat the whites up along with the sugar. Stir the yolks and gently mix them into the beaten whites. Add the flour in smaller portions, and stir it gently after every portion of flour. Line some baking paper into an oven pan and pour the mixture into it. It needs at least 25 minutes at 160 deg Celsius, you can check if it's done with a needle or a knife. When it's done take it out and let it cool down, then cut it in half horizontally, and put the lower part back into the oven pan (this time you have to line it with kitchen film). 

For the cream, mix the two types of yoghurts together and grate the lemon zest into it, add the vanilla and the cinnamon too and stir it well. You can adjust the taste with sweetener and lemon juice until it's sweet and sour enough. Then dissolve the gelatine in some cold water and put it on the heat until it starts boiling. Take it off the heat, wait a couple of seconds and then add some of the yoghurt mixture to the gelatine. Stir it and then pour it back to the rest of the yoghurt, and mix it well. Slice the peaches and lay them on the lower part of the sponge cake, then pour the cream onto it and put the whole thing into the fridge until the cream becomes solid. Then you can cut it up :)