Rinse the fillets and pat dry. Rub with olive oil and season with sea salt.
Put the lentils in two small pots (one type in each pot). To each pot, add 1 clove garlic, 1½ teaspoons butter, and 1 teaspoon sea salt, along with 1¼ cups cold water.
Cook the lentils gently until tender, about 30 minutes. There should be no liquid left. Keep the lentils in t