Drink it little by little throughout the day!! Failing that put on ice cream for pudding or a favourite here - is to have a meraingue base and then fruit and pour evap over. Maybe include ice cream if you want!.
You can make a mousse type thing with jelly if you have any. Just dissolve the jelly as normal in a little bit of water, then add the evaporated millk and any additional water needed to make it up to a pint and then whisk it it a large-ish bowl until it looks like mousse. It's a granny special - my kids love it!!