The Day Before Baking
Soak the Fruit: In a large bowl with a lid, combine all dried fruits. Add rum, stir well, cover, and let sit overnight (up to a week, stirring occasionally).
Baking Day
Preheat and Prepare the Tin: Preheat oven to 140°C/120°C fan/275°F/gas mark 1. Grease an 8-inch round cake tin and line with a double layer of parchment.
Cream the Butter and Sugars: In a large bowl, whisk together the softened vegan butter, dark and light brown sugars, treacle, and citrus zests until light and fluffy.
Combine Dry Ingredients: In a separate bowl, sift together flour, ground almonds, bicarbonate of soda, mixed spice, cinnamon, and nutmeg.
Mix the Batter: Add the dry ingredients to the butter mixture, followed by soy milk and lemon juice (or vinegar). Stir until just combined; the batter should be thick.
Add Fruits and Nuts: Fold in soaked fruits (with any remaining liquid) and chopped almonds. Mix until evenly distributed.
Bake: Spread the batter evenly in the prepared tin. Bake for 2-3.5 hours or until a skewer comes out clean (typically around 2.5 hours).
Cool and Feed: Let the cake cool completely in the tin. Turn out and brush with additional rum or brandy.
Store: Wrap in parchment, then foil, and store in an airtight container. Feed with rum or brandy every 1-2 weeks for up to 3 months.
Enjoy this beautifully spiced, boozy fruit cake for the holidays!