Fiddleheads
Growing up in Maine with a mother that liked to garden and try new dishes I got to experience a wide variety of foods. Not all of these culinary experiences ended well. I developed a reflexive hate of eggplant and still don't care for raw tomatoes. I don't think these had anything to with my mother's cooking but more likely my own personal quirks :) In any case I've had scrumptious brussle sprouts, eatable lima beans, and many other vegetables that when done wrong more than earn their stereotype of nobody liking them.
One of the very seasonal items I remember growing up were fiddleheads. They are young coiled fern leaves (about an inch in diameter) of the ostrich fern. The season for them is usually just April and May. Luckily while in one of the local grocery stores over the past couple of weeks, they had a bin of them for sale. I snatched up a bunch and finally got around to cooking them tonight. I did a stir-fry with oil, garlic, chili sauce, and oyster sauce. Very yummy.
For other recipes and facts about fiddleheads swing by the University of Maine Cooperative Extension's page about them.