Colorful and bright in both flavor and appearance, this dish is a splash of sunshine for dark winter days. The purpose of the citrus rounds is twofold: They infuse the salmon with flavor, and they keep the fish from sticking to the bottom. While rich salmon works with the creaminess of the beans and punchy citrus flavors, a flaky white fish such as hake, cod or halibut would succeed equally well. Adjust the cook time depending on the thickness of the fish. Serve with couscous or a citrusy green salad.