This recipe features tender halibut fillets served on a bed of flavorful lentils and topped with a tangy mustard sauce. The lentils are cooked with aromatic vegetables and herbs, creating a hearty and nutritious base for the fish. The halibut is pan-seared to perfection, resulting in a crispy exterior and moist, flaky flesh. The mustard sauce adds a zesty kick to the dish, complementing the delicate flavor of the fish. This elegant and satisfying meal is perfect for a special dinner or a weeknight treat.