Preheat the oven to 180°C/160°C fan/350°F/gas mark 4. Grease an approx 20cm / 8in square baking dish or cake tin.
Place the chopped dates and bicarbonate of soda in a large jug and stir in the boiling water. Set aside to soak for 10 minutes so that the dates are nice and soft.
125 g (4 ½ oz) pitted dates, 1 teaspoon bicarbonate of soda (baking soda), 180 g (¾ cup) boiling water
Pour the dates and their soaking liquid into a blender. Add the pumpkin puree, oil, sugar and treacle. Blend until smooth.
160 g (⅔ cup) pumpkin puree, 73 g (80ml/⅓ cup) oil (I use olive), 75 g (6 Tablespoons) dark muscovado or soft brown sugar, 50 g (2 Tablespoons) treacle or molasses
Scrape the blended mixture into a large bowl and whisk in the baking powder, pumpkin spice and salt, followed by the flour. Don’t over-beat the batter, just stir until no dry lumps remain.
2 teaspoons baking powder, 2 teaspoons pumpkin spice, ¼ teaspoon salt, 200 g (1 + ⅔ cups) plain (all-purpose) flour
Scrape the batter into the greased tin and spread it level. Bake for 25-30 minutes until a skewer inserted into the centre comes out clean.
Make the sauce while the pudding is baking. Place the butter, light brown soft sugar and treacle in a saucepan over a low heat. Stir until it is melted and smooth.
150 g (⅔ cup) vegan block butter, 150 g (¾ cup) light brown soft sugar, 30 g ( 1 ½ tablespoons) treacle or molasses
Add the cream, pumpkin puree and vanilla extract, stir until smooth, bring up to a simmer then remove the pan from the heat. Add a pinch of salt to taste (carefully, it will be extremely hot!).
150 g (½ cup + 2 Tbsp) non-dairy cream (home-made cashew cream, soy cream, Elmlea plant double or coconut cream), 60 g (¼ cup) pumpkin puree, 1 teaspoon vanilla extract, good pinch of salt to taste Allow the pudding to cool in the dish for 10 minutes then prick the surface all over with a toothpick and drizzle over about ½ of the toffee sauce, making sure that the top of the pudding is fully covered.
Leave to cool for 20 minutes then slice into 9 slabs and serve with ice cream or custard and the rest of the sticky toffee sauce. (The sauce will thicken as it cools, simply reheat it in a pan or in the microwave for a few seconds until it becomes pourable again).