Cooked mushrooms. As a kid, I viscerally hated the smell of mushrooms, to the point it would make me gag whenever we had them for supper. The aversion gradually lessened over time. Then when I moved out and started cooking on my own, I suddenly found them delicious! To the point that I now like to add them to almost any savory meal.
Sausages, but they have to be good quality ones. Cheap ones can get in the fucking bin.
I used to dislike the taste of licorice. I used to eat the sweet bits from those licorice cubes my dad had when I was a kid and then throw away the licorice parts.
Don’t know when that changed, but I was on the way home with my old man (I may have been late teens/early 20’s?) and I was quite hungry. All he had in the car at the time was licorice and it was one of the most delicious things I ever had.
He sometimes playfully complains that he remembered a time when us kids never liked licorice or pepper and now we eat him out of a house.
Eggs. I did not like them at all (except as an ingredient in pancakes) for a quarter of a century. Now I do like myself a hard boiled egg with a pinch of salt for breakfast
Spicy food. I think my sense of taste has gotten dull as I got older so now I like that extra kick.