Pour sifted flour, yeast, sugar, salt into a bowl and mix. Leave to stand for 2-3 minutes. Grate the lemon zest. Mix the egg with the butter.
Add vanilla, lemon zest, egg-butter mixture and milk to flour. Knead the dough. Leave to stand at room temperature for two hours. When the dough has rested, roll it into a rectangle. Then brush the dough with olive oil and sprinkle with brown sugar and cinnamon.
Roll the dough into a log and place on a baking sheet in a circle. Next, make deep cuts on the outside and unfold each cut piece. Leave to stand for another 30 minutes. Next, bake at 180-200C for about 20-30 minutes until golden brown. Mix powdered sugar with water and brush the resulting mixture onto the finished cake.
Serve by cutting into portions. Top with toasted nuts. Brew fruit tea, latte or cappuccino.