Tatiana Cake

I got this recipe on a forum when I had been hunting for it for a long time. The cake is being prepared for quite a long time, but the result is worth it.
Beat eggs in a mixer, add sugar. After gradually adding: slightly warmed honey, flour with baking powder (first you need to mix the baking powder with flour, this is important), steamed and dried raisins, toasted and chopped walnuts. The resulting dough is covered with cling film and put in the refrigerator for six hours. Take out, mix. Prepare the oven by warming it up to 180 degrees. We line the baking dish with oiled parchment paper, and carefully spread our dough on top, or rather, one third of it. The cake "Tatiana" is baked in three separate cakes. Each cake will take at most twenty minutes. We cool all the cakes separately from each other, because they easily stick to each other. At high speed of the mixer, whisk the cream, gradually adding powdered sugar. At the very end, put sour cream and whisk for another three minutes. Personally, I did not divide the dough into three parts, but into more. One cake was baked especially for crumbs. We coat all the cakes with cream, the sides and the top too. And sprinkle with crumbs from the "extra" cake. It will turn out very tasty and beautiful sweet food.