"I've always loved sardines, ever since I was a kid," says Pontoon chef Lance Cameron. "At Pontoon, I like to serve them with spicy harissa, and pickled radishes and shallots on crisp, buttery puff pastry. It's a really delicious snack if you like sardines. If you can't get fresh sardines at your local fishmonger, use blue mackerel instead." Start this recipe at least a day ahead to make the pickle.