Preheat your oven to 350°F (175°C) and grease a loaf pan with butter.
In a large mixing bowl, mix together the stout, melted butter, molasses, browning, honey, egg and vanilla extract until well combined.
Use a sieve to sift in the flour, brown sugar, baking powder, baking soda, cinnamon, nutmeg, allspice, and salt. Begin to mix, if too thick, you can add 1 tbsp of water.
Fold in the dried fruits until evenly distributed throughout the batter.
Pour the batter into the prepared loaf pan and smooth the top with a spatula.
Bake in the preheated oven for 50-60 minutes, or until a toothpick inserted into the center comes out clean.
Once baked, remove the bun from the oven and let it cool in the pan for 10 minutes before transferring it to a wire rack to cool completely.