Preheat the oven to 175℃.
Prepare you loaf tin (9” x 5” or 23cm x 13cm).
Prepare the buttermilk/sour milk, and set aside.
Sift the dry flour, baking soda, ginger, nutmeg and salt into a large mixing bowl, and set aside.
Cream the butter and brown sugar until smooth and pale.
Pour in the molasses and beat until rich in colour.
Add the egg and beat again.
Pour the wet ingredients into the mixing bowl, alternating between the creamed molasses and buttermilk.Use your dough whisk to bring it all together into a wet mixture. Once the mixture comes together, pour into your prepared loaf tin and bake for 45 minutes.
Let the loaf cool for 10 minutes in the loaf tin before tipping onto a cooling rack.
Allow the loaf to cool completely before cutting.