I didn't eat vegetables until I was nearly 23, and my method is to hide them until I'm sufficiently used to the taste that I can eat them with a minimum of seasonings. I had this horrible mayonnaise/cheese/olive oil mix that I would put on cauliflower before I baked it, and I could barely taste the cauliflower. Right now I'm trying to get used to organ meats using very spicy and flavorful curries -- I get a taste, so I can acquire that taste, but never enough to put me off my meal.
Riced cauliflower is pretty awesome, and you can prepare many vegetables to taste like french fries -- sweet potatoes in particular are pretty amazing sliced thin, doused in some fat and baked. Try kale chips, too. I like almost all vegetables better if they're a little burnt. You can even pour a tiny, TINY bit of sugar or honey on them (mix honey with some oil so you don't have to use a ton of it) to make them caramelize.
Try using loads of garlic and butter, if you eat butter. Tomato sauce is great; so is guacamole. If you like balsamic vinegar, try some of that.
The vegetables I've found least offensive and was able to eat almost right away include butternut squash (also you can put cinnamon on that), baked carrots and sweet potatoes. Must be something about the orange ones. Artichokes are great too, but I'm not sure who has access to those or what they cost in other parts of the country; they're somewhat abundant in California but I know it's not the same everywhere.