First, prepare the crust. Mix the eggs with melted butter and olive oil. Add rosemary, oregano, sea salt. Start adding ground walnuts, almond flour and ground flaxseed. Using your hands work the dough.
Grease 9" pie pan with some butter and place the dough in it. with your hands, spread the dough all over the bottom and the sides of the pie pan.
Bake at 170ºC for 10 minutes.
In the meantime, saute finely chopped leek and mushrooms in olive oil. Add all the spices and mix well. When the leek and mushrooms are soft, remove from heat. Using an electric mixer mix sour cream and eggs. Mix this together with leek and mushrooms and place it in the half-baked pie crust.
Bake for another 20 minutes at 170ºC. Serve warm, decorated with freshly chopped rosemary. Make sure you don't cut the pie while it's still hot.