Open the cider so that it loses its fizz. Preheat the oven to 170°C, and grease your bundt tin with non-stick cooking spray, or simply oil it, and leave the tin upside down on a piece of newspaper or baking parchment while you get on with the batter.
Measure the oil, brown sugar and (whether you’re weighing it or going for volume and using a cup measure, always lightly oil the receptacle for the treacle first and it will slide out easily) black treacle into a bowl.
Pour in the cider and crack in the eggs, add the ginger and beat till smooth. While I use a freestanding mixer to make this cake, it’s simple enough by hand: in which case, beat the eggs together first before adding to the other ingredients.
In another bowl measure out the flour, baking powder, bicarb, nutmeg, 5-spice and cinnamon, and fork through to combine.
Gently tip the dry ingredients into the wet treacly mixture, beating as you go to make a smooth batter. Scrape the sides and the bottom of the bowl well to make sure there aren’t any pockets of flour.
Pour the dark and aromatic batter into the prepared tin: it will be very runny, but don’t be alarmed. Place in the oven to bake: if using the bundt tin it will need 45–50 minutes, but start checking after 40. If using the square tin, it will need 50–55 minutes’ baking. When the cake’s ready, it will start to come away from the sides of the tin and a cake tester should come out clean; that’s to say, not wet, but with some crumbs adhering to it. Transfer the bundt to a wire rack for about 30 minut