Name: Healthy chocolate cake
Total time: 2 h
Yield: Serves 14
Ingredients: 300g sweet potatoes; 250g dates (after stones removed); 75ml cold-pressed rapeseed oil; 350ml almond milk; 1½ tbsp cider vinegar; 350g wholemeal self-raising flour; 50g cacao powder; 1 tsp bicarbonate of soda; 1 tsp vanilla extract; 150g dark chocolate roughly chopped, plus 10g, grated; 1 orange zested, juiced to make 1 tbsp

A chocolate cake on a glass cake stand with a slice taken out of it

300g sweet potatoes
250g dates
(after stones removed)
75ml cold-pressed rapeseed oil
350ml almond milk
1½ tbsp cider vinegar
350g wholemeal self-raising flour
50g cacao powder
1 tsp bicarbonate of soda
1 tsp vanilla extract
150g dark chocolate
roughly chopped, plus 10g, grated
1 orange
zested, juiced to make 1 tbsp

Method

step 1
Heat the oven to 190C/fan 170C/gas 5. Pierce the sweet potatoes in several places, then put on a small tray. Bake for 1 hour or until soft throughout, then remove from the oven and leave until cool enough to handle.
step 2
Put the dates in a medium bowl and cover with just-boiled water. Leave to soak for 30 minutes. Drain, reserving 2 tbsp of the soaking water, and put the dates and reserved water in a mini food processor. Blitz until smooth.
step 3
Oil the bases and sides of two 20cm loose-bottomed sandwich tins using ½ tsp of the oil, then line the bases with baking paper. Put the almond milk in a jug, add the vinegar and leave to sit. Sift the dry ingredients into a large bowl. Make a well in the centre and add the puréed dates, almond milk, oil and vanilla. Beat well until smooth. Divide the mixture between the prepared tins and bake for 25-30 minutes or until a skewer inserted into the middle of the cakes comes out cleanly. Leave to cool in the tins for 10 minutes, then turn out onto wire racks to cool completely.
step 4
Scrape the insides of the sweet potatoes into a medium pan. Add the chocolate and, on a low heat, continuously mix until the chocolate is melted and the mixture is mostly smooth. Transfer the mixture to a food processor while still warm, along with the orange zest and juice. Blitz for 2 minutes until completely smooth. If the mixture looks too thick, add 1-2 tbsp of just-boiled water and continue to beat until smooth. Leave to cool, then spread all over the cake. Decorate with the grated chocolate.