It seems like I needed 50+ years to fully appreciate fennel. But I have arrived and hopefully you have too! While fennel and onion look very similar, they’re not even closely related. But when cooked, the sweeter side of both come out. Cooking the onions and fennel until they are almost melted and jammy is the secret behind Jammy Fennel and Onion Pasta (Gluten Free). The pasta is highlighted by the sweet, salty, and slightly spicy pairing of the ingredients which blend together with perfect harmony.