A batter-based cake with a streusel top, at its best served straight from the oven accompanied by a bowl of thick, cool cream.
Sieve the flour, sugar and baking powder into a bowl. Mix together the lemon zest, egg, milk and oil, pour on to the dry ingredients and beat together until smooth. Pour into the prepared cake tin. Pour the melted butter on top and sprinkle over the sugar sifted with the cinnamon. Distribute the nuts over the mixture, slightly pressing them into the streusel layer.
Bake in the preheated