Foreign 'Fruit'

I have blipped it a while back, but made no mention of it, because I don't know what it is! One of the school kids brought it to school one day and when Charmaine asked about it, he gave it to her. We did a 'tongue tip taste', almost tasteless, but left a slightly bitter after taste! Anyone out there who can help with the identification?

'One Year Ago' - Red Green Aloe Succulent Plant