Grease a small ovenproof dish – I used a 16.5cm round dish.
In a bowl, whisk egg with sugar until pale and thick. Add in the melted butter and whisk.
Blitz half the orange - skin and all (see note) - until it’s pulped and stir this into the egg/sugar mix. Add in flour, baking powder and almonds. Stir until combined. It should easily drop off a spoon. If it’s too stiff, add in 1-2 tbsp milk.
Scrape the batter into the greased dish.
In the batter bowl (scraped clean) mix the boiling water, brown sugar, butter, cornflour and juice from the remaining half orange. Gently pour this over the back of a spoon and on to the batter.
Bake for 35-40 mins, or until sponge is cooked through.
Serve with yoghurt or whipped cream.
Notes:
For very pithy fruit, use the skin and flesh of the orange but not all the pith – too bitter.
Use any citrus – mandarin, lemon, tangerine.
To make pudding gluten-free, replace plain flour with slightly less (about 1 tablespoon less) GF flour.