Heat oven to 180°C ordinary – i.e. not fan – this doesn’t work as well on fan oven.
when the oven is up to temperature is a good time to toast the walnuts if you're going to - 150°C for 10 mins. Break them into small pieces once they're toasted and cooled.
Chop the dates - in half, first, then into 4
Brush a 450g loaf tin with a little oil or margarine then line the bottom with greaseproof paper also greased.
Mix the flour, ground almonds, baking powder, salt, mixed spice & sugar together.
Whisk the aqua faba until it's quite stiff and around 250ml in volume
Whisk or beat together the mashed banana, oil etc, but not the aqua faba.
Pour all the now mixed wet ingredients on top of the dry ingredients.
Whisk together with a hand electric mixer (works best) or mix quickly with a wooden spoon.
Quickly fold in the aqua faba until well mixed.
Pour the mixture into the prepared tin.
Shake back and forth enough to level the contents.
Bake for 35 mins on middle or just above middle shelf, turning down to 150°C for the last 30 minutes & covering the top towards the end if it starts to look too brown.
After the 1 hour - Insert a skewer into the centre of the cake – it should come out clean. If not, return to the oven and cook for a further 5 to 10 mins.
Cool for 15 mins before taking it out of the tin.
Allow to cool thoroughly before slicing.
Very nice with margarine and peanut or almond butter, or just as is.