Sole Thermidor is a classic French seafood dish made with sole fillets, cooked in a creamy and flavorful sauce. The fish is first poached in white wine and then topped with a rich mixture of sautéed mushrooms, shallots, and a creamy sauce made with egg yolks, Dijon mustard, and Gruyere cheese. The dish is then broiled until golden and bubbly, creating a deliciously decadent and elegant main course.