Heat oven to 450 degrees. Season salmon with salt and pepper. Dust skin with flour. Heat remaining oil in a heavy ovenproof skillet. Add salmon, skin side down, and sear on high heat 2 to 3 minutes until skin is browned. Turn salmon, place skillet in oven and bake 5 minutes for medium rare, or longer to taste.
04Distribute lentils among four warm dinner plates and top with salmon, skin side up. Heat liquid drained from lentils, whisking in butter. Season to taste. Spoon over and around salmon and lentils. Garnish with remaining thyme and serve.