1. Heat two tablespoons of the butter in a medium-sized saucepan over medium heat. Add chopped shallots and cook until they are translucent. Make sure that the butter does not brown. Add lemon juice and remaining butter.
2. When the butter has melted, add marble potato and broccoli. Cook the vegetables for a minute. Then, gently place the fish into the pan. The cooking liquid should cover the fish 2/3 up the side of the fish. Turn the temperature high and allow the fish to cook for three minutes once the cooking liquid begins to boil. Turn the heat down and allow to cook on low for an additional minute.
3. Finish the recipe with a touch of sea salt!