..it sounds horrible but it helps you to save money AND you get a treat at the same time with only 2 ingredients!
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2 bananas that are going black (that you arent likely to eat!)
400 ml skimmed milk (or replace with almond milk to make vegan)
slice the banana, place on a tray then freeze for at least four hours (or even over night)
add half the banana and all the milk to a blender (or use a hand blender) blend, then add the other half of the banana (here is where you could add protein powder, peanut butter or is you are feeling naughty some chocolate spread!)