Bake the sweet potatoes, skin on, for about 20 minutes until soft and cooked. Allow to cool before scraping the flesh out of the skins and mashing until all the lumps are removed
Toast the flaked almonds, shaking a couple of times to get a uniform colour. This takes 5-8 minutes
In a medium-sized mixing bowl, combine the sugar, eggs, oil and water until the sugar has dissolved
Add the cooled, puréed sweet potato
In a large mixing bowl, sift the flour, bicarb, baking powder, cinnamon and salt. Make a well in the centre
Pour the wet ingredients into the well of the dry and combine well
Spoon the batter into the prepared muffin tins, sprinkle a little demerara sugar on top of each and put in the oven
Bake for 20 minutes before allowing to cool on a wire rack
They can be eaten warm or cold and can be stored in an airtight container in a cool place for up to 5 days