Preheat oven to 175 degrees celsius (fan-forced). Grease a 6 cup capacity baking dish and set aside.
Peel, core and chop the apples into chunks. Place the apple chunks into the Varoma dish and sprinkle the 50g of sugar over the top. Fill the Thermomix bowl with 500g water and cook for 10 minutes, Varoma temperature, Speed 2 or until the apple has just started to soften.
Drain any excess liquid from the apple chunks and then spoon into the base of the prepared baking dish. Set aside.
To make the sponge pudding, clean and dry the Thermomix bowl.
Place sugar and butter into the Thermomix bowl and and mix for 15 seconds, Speed 5.
Add the eggs and vanilla extract and mix for 15 seconds, Speed 5. Scrape down sides of mixing bowl with spatula, then mix for a further 10 seconds, Speed 5. With the blades turning on Speed 2, slowly alternate adding the self-raising flour and the milk through the MC hole. Mix until combined and then spoon the sponge mixture over the top of the stewed apples.
Bake for 30 minutes or until golden on top and cooked through.
Serve immediately with ice-cream, cream or custard.