Preheat the oven to 180C (fan 160C/gas mark 4). Pop the dates in a bowl and cover with 400ml boiling water. Add the bicarbonate of soda and leave to soak and cool.
In a bowl or stand mixer, mix the brown sugar and butter together until light and fluffy. Add the eggs and whisk together. Next, add the cooled dates and most of the liquid and whisk until combined. Finally, add the flour, cinnamon, mixed spice and baking powder. Mix until fully incorporated.
Next, line and butter the loaf tin or baking tin. I prefer to use a loaf tin for this recipe. Add the cake mixture and pop in the oven for 35β45 minutes or until the knife comes out clean.
While the sponge is baking, start making the toffee sauce. In a pan, heat the butter and sugar together until melted, then add the double cream. Bring up to the boil then add the rum.
When the sponge is ready, dot with a few holes here and there. Pour half the sauce over the sponge while itβs still in the tin and allow it to soak in for 15β20 minutes. Remove from the tin, slice thickly, and serve with vanilla ice cream and the remaining sauce.