These curly discs hit farmer’s markets and specialty stores mid-spring, when they’re picked from young ferns before the leaves uncoil. Fiddlehead ferns taste similar to asparagus, but crunchier and bitterer. They’re packed with healthy antioxidants, but their real claim to fame is omega-3 fatty acids. “You don’t find a lot of fat in plant sources beyond seeds and nuts,” says Nolan Cohn. Omega-3s, often found in fish, are healthy fats that could boost brain and heart health.