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Anyone for a spot of crumble? Edible eye gunk crumble, that is! Dr Chris and Dr Xand experiment with a tasty recipe demonstrating the eye and rheum... otherwise known as eye gunk or sleep. Pass the custard!

Step 1: Take flour and oats, mix with sugar and butter, cinnamon and ginger in a bowl with your fingers tips. The mix should have the consistency of breadcrumbs or crumble!

Step 2: Place the crumble mix onto a baking tray, spread evenly and get your grown-up to place it in a pre-heated oven at 200°C or 180°C fan (or gas mark 6). Don't forget to remind your grown-up to use oven gloves.

Step 3: Set a timer for 10 minutes and ask your grown-up to stir the mix halfway through.

Step 4: Meanwhile draw an eye to go under the over proof dish. 

Step 5: Add the apple wedges and brown sugar to the dish. 

Step 6: Squeeze lemon juice onto the apples.

Step 7: Add custard on top of the apples, sugar and lemon juice.

Step 8: Ask your grown-up to take the tray from the oven once the crumble is ready and allow to cool a little.

Step 9: Sprinkle the crumble on top of the custard.

Step 10: Take the tin foil and cut into strips to make eyelashes and eyelids. Pinch the foil closed (like an eyelid).

Step 11: Put raisins onto of the foil and ask your grown-up to place it back in the oven for 50 mins until golden brown.

Step 12: When ready, get your grown-up to take it from the oven and allow it to cool down before tucking in to your delicious eye gunk!

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

Want to show off your brilliant experiment results? Send your photo or short video to us by clicking the blue 'send your stuff' button below, and it might be shown in our Op Ouch! gallery.