Marinara pasta, as a kid. I spat it out straight away.
Also lime-flavoured milk, but then I eventually grew to like it ... a lot.
What's something you used to hate but now you really like?
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It is easy to go down into Hell;
Night and day, the gates of dark Death stand wide;
But to climb back again, to retrace one's steps to the upper air –
There's the rub, the task.
– Virgil, The Aeneid (Book VI)