1. Start by soaking the walnuts and pecans for one hour. In other words, throw the nuts in a bowl. Cover them with water so that they are completely covered plus one inch or so. Let them sit like that for an hour. After the time has passed, drain the nuts. Then rinse them quickly and drain them again. The point of doing this is to make the nuts soft, and also to sprout them so that they start to release enzymes.
2. After you've done all the above to the nuts, throw them in a food process and blend them up until they are very well blended, so that they look like a chunky flour. Basically, you should just see little chunky bits of nuts.
3. Then, add everything else to the food processor and continue blending. You'll probably want to add the ingredients one at a time otherwise your food processor might get all munged up.
4. Keep on blending until your mixture looks like a big ball of dough, like you can see in the picture. There shouldn't be big chunks of anything. You will probably see small flecks of nuts though.
As you can see, this recipe makes a lot of cake. You may want to halve this raw chocolate cake recipe if you have a small family.
Once you've got a giant raw chocolate cake dough ball, then the fun begins. You do not need to dehydrate this or anything, the cake is basically done now you just need to figure out the presentation (shape and icing or whatever you want).
5. Just press the dough into the desired shape for whatever you want to make. For example, just take a nice cake plate and press the dough into a cake shape. Ice it using your favourite icing, like in the picture above.
You could also split the dough in half and press half of it into a cake shape, add some fruit or icing or whatever on top of the first half, then put the remainder of the raw chocolate cake recipe on top to make a layer cake effect.