"Generously rub rock salt into the salmon’s skin. Cook the salmon until the bottom of it appears golden-brown, which will … Flip the fillets over, lower the heat and cook for 2 mins more, then drizzle with the lemon juice. The residual heat in the pan will cook the rest of the fish. Want the new recipes in your inbox. Serve with a side of buttery, seasonal green veg for a filling supper. Cook until skin is browned and crisp, about 3 minutes.