This simple dish made with just a few flavorful ingredients is easy enough for a weeknight meal, but it can also be served for an elegant dinner party. Braise thinly sliced leeks in a mixture of chicken broth, white wine vinegar, butter, and herbs until they’re soft and almost melting. Just before the leeks are ready, sear the halibut. Serve the fish fillets over a bed of the leeks drizzled with some of the braising liquid. You won’t feel guilty following up this light dinner with a rich chocolate dessert.