Riddle: I'm black on the outside, but blue on the top. On the inside I'm usually green, but also reddish, purplish. I can be sweet and sour. What am I?
Answer: A blueberry.
Source: https://riddles.com/index.php/3621
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I'm black on the outside, but blue on the top. On the inside by Gia Minh Bui Riddle