Preheat the oven to 180C fan/200C/400F/gas mark 6 and line an 8 hole mini loaf baking tin.
In a large bowl/bowl of a stand mixer, add all the cake ingredients and combine until smooth. If very stiff, add a little more milk. Pour into tin and bake 20-25 minutes, until golden and a skewer inserted comes out clean.
Whilst warm, make the drizzle and pour over. Let cool, top with more zest and eat!