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This is one pudding that will ALWAYS develop a skin! Check out Dr Chris and Dr Xand's recipe for an epic scab pudding experiment. Gross!

Step 1: Pour 200ml cold water into saucepan and bring to boil.

Get a grown-up to help and cover surfaces to prevent staining.

Step 2: Add 12g powdered gelatine and stir continuously so it doesn't stick to the pan until dissolved.Ìý

Step 3: Turn the heat off and leave to cool for 15 mins.

Step 4: Meanwhile, make up the jelly using the packet instructions.

Step 5: Pour the jelly into the bottom of each of the glasses and put in fridge to set.

Step 6: Add red food dye to the melted gelatine once 15 mins is up and stir to combine.

Step 7: Take your plate, cover it with greaseproof paper and pour the red gelatine mix into the middle. Don't let it drip off the plate!

Step 8: Set aside for 3-4 hours.

Step 9: Once the jelly is set, get the glasses from the fridge and sprinkle on rice pop cereal.Ìý

Step 10: Pour custard over the rice pop cereal.

Step 11: Mix a little cold milk with the blancmange mix to make a smooth paste.

Step 12: Heat the rest of the milk in a saucepan. Get a grown-up to do this, hot milk can be dangerous.

Step 13: Add the paste and sugar to the hot milk and stir.

Step 14: Once thick, leave to cool a little, then pour over the custard and put the glasses in fridge to set.

If you are using strawberry yoghurt or mousse, skip steps 11-14 and just pour it over the custard - there's no need to set the glasses in the fridge.

Step 15: The red gelatine should be solid, so cover your custard with circles or slices of gelatine to form edible scabs!

Dig in, yummy!

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Watch the whole episode of Operation Ouch! Do Try This At Home: Itchy Crusty Scabs on ´óÏó´«Ã½ iPlayer.