Brussel Sprouts. Absolutely hated them as a kid, which I blame my mother for. She "steamed" them in the microwave in a dish with water. Turned them into a slimy, horrible mush. My wife sautes them in a pan, with bacon. It's one of my absolute favorite dishes now.

As a kid, I thought I hated steak, but it turns out, my mom was just really bad at cooking steak.

Black coffee. Used to only drink coffee with creamer or lattes/cappuccinos, but now I drink black because I can't stand the sugar crash

Sour cream. As a kid, I didn't like it. Now it's essential on my tacos, pierogi, and chili.

Tomatoes or mushrooms. Both were a texture thing. I made some diet changes as an adult, so I’m not sure if that helped in changing my opinion, but now I’m fine with mushrooms and grow tomatoes in my garden every year!

Asparagus.

Used to hate it, had it once in season in Germany, it was so fresh and delicious, I learned how to enjoy it there.

I heard that stuff like green vegetables are unpalatable to children because they taste more bitter to them.
As you grow up you become more insensitive to those flavors and start tasting the other compounds that you actually like.

Eggplant. I tried cooking it until just tender, like zucchini - and it was nasty as hell; I never got it and never wanted to.

Then I encountered some actually properly cooked stuff in a pasta dish when eating out and ohmygod.

Onions

tomatoes. hated them as a kid. juicy burgers were may gateway into them.

Olives. I still am not a fan of black olives, but I'd eat an entire jar of green.

Guldens Spicy Brown Mustard. Dad was from Brooklyn and loved it, as I kid I just wanted the neon yellow stuff all my friends had. Now, many years later, I always have it in my fridge.

Vegetables in general.

Except Lima beans. You can go FUCK YOURSELF!!

grits. the way my mother made them when I was a kid was plain and kind of unpleasant. I add sausage and cheese to mine.

Anchovies on pizza. Just a couple though, like fish sauce, a little goes a long way.

Same with vegetables, but also steak and bacon. I hated steak and bacon as a kid idk what was wrong with me

Sweet potatoes. Something about them made me gag. Every Thanksgiving a heaping pile of them would wind up on my plate and I'd have to power though or else face the wrath of my grandmother.

Nowadays I love them. Dunno when the switch happened.

Some different vegetables and mushrooms.

For me it was eggs. My mom wasn't that great a cook and she'd only make two types of eggs: hard boiled eggs or these sort of way way overcooked sunny side up eggs. Never liked either so grew up thinking I just don't like eating eggs.

Later on as I got older I realized there are other egg dishes and I actually really like eggs. Scrambled eggs is pretty much my favorite breakfast. A close second is egg and cheese on a bagel.

Both chili and vegetable soup.

Never cared for either growing up, but now they're both comfort food, especially on cold days.

Fish in general. As a kid I absolutely disliked the strong taste and oily texture.

I'm very open with my foods and like to retry everything I disliked in the past, things I still don't like are Olives (weird metallic taste I don't like), Tomatoes (slimy texture at normal size, cherry tomats are fine), unaltered boiled egg yolks (so dry, so so dry), Oatmeal (texture issue), and a couple others I can't think of at the moment. I enjoy most of the texture based ones as soon as the texture is altered.

Italian cured ham, I used to hate the taste and texture, but now, it's great!

Brussel sprouts used to be truly awful, made me literally wretch. Now I eagerly make and order them as a bar snack.

To be fair there are two reasons beyond my changing tastes for this. First, my mom liked to steam brussel sprouts whole and serve them with margarine, salt, and pepper, now I generally cold sear them or roast them in the oven with much better seasoning. Maybe even some bacon pieces and blue cheese mixed in. Second, brussel sprouts did actually change over time to get less bitter and awful since I was a kid.

Bananas and potatoes. I can't say that I enjoy bananas now, but I tolerate them kinda and eat them regularly.

We ate potatoes for just about every meal when I was a kid so I started to dislike it, but now I love potatoes in every form and eat it as much as I can.

Beets, hated em growing up, absolutely love em these days

Pumpernickel & rye breads. Maybe it was the "brown bready thing must be chocolate" mentality of a kid or maybe just that it wasn't white bread. But damn if that isn't the most delicious shit for toast, bagels, and sandwiches.

Hummus. I have some textural food aversions. Mushed up doesn't usually cut it and so I 100% judged hummus on its look and smell. I gave it a shot a couple of years ago and I can't get enough of it. It took me until I was like 45!

Sauerkraut was just too overwhelming as a kid, but I love it now. Some other foods were the same, but that is the one I remember.

I liked black olives as a kid, then hated them in my teen years through early 30s and find them tolerable now.

A lot of people hated vegetables as a kid if they were made bland by boiling, and like them a lot more when they have them roasted or just with some seasoning. I remember having bland steamed brussel sprouts at home which are just awful but one of my friends roasted them and they were awesome. My dad cooked up some awesome seasoned steaks and that friends parent bought the wrong cut and cooked it well done so it opened my eyes to how much of a difference preparation makes.

Pig and chicken feet. Fat is so good.

I fucking love Cauliflower, I thought I didn't like it because I grew up poor and didn't really get fancy veggies