Preheat oven to 180°C. Grease a small ovenproof dish.
In a bowl, whisk egg with sugar. Add in the melted butter & whisk. Blitz half the orange—skin and all—until it’s pulped then stir this in. Add in flour, baking powder, and almonds. Stir until combined. Add in 1-2 tbsp milk if it’s too stiff. Scrape 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 batter.
Bake for 40 mins, or until cake bit is cooked through.
Serve with ice cream or whipped cream.
