Separate white egg with egg yolk. You can use the egg yolk to make creme brulee for example..
Beat white egg until they get foamy and add sugar in one time while whipping.
Incorporate carefully with the preparation made of nut and almond powder and powedered sugar. Fill in your pastry bag or a freezing bag where you cut the extremity.
On a baking paper draw the form of the cake using your log mold. Make your biscuit using the drawing and use the rest (you will have plenty of it) to form little biscuits that you can eat together with a good tea cup.
Preheat oven to 180°C. Sprinkle your biscuits with powedered sugar and for approximately 10 minutes. Then remove quicly from baking tray and leave to cool on a rack so the biscuits doesn't become soft. That would be a shame with all this work.
Place your biscuit on top of the bavarois in your log mold and leave in the fridge for few hours to one night. Or place in your freezer.
Unmold. If you have difficulty your can always use a fan.for a few seconds. Put on a rack placed on top of a recipient to keep the excedent of coulis.
To make the coulis, heat raspberries with water, sugar, and agar-agar until you get a coulis. Sieve and coat the log.