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Melt 2 tablespoons butter in skillet. Add onion and sauté until transparent. Stir in spinach, oregano, 1/4 teaspoon salt and 1/8 teaspoon pepper.
Put about 1 1/2 tablespoons spinach mixture on each flounder fillet; roll up.
Put fish rolls in baking dish, seam side down. Add wine. Cover and bake 25 minutes at 350°F.
Drain and reserve 1/2 cup of the liquid. Keep fish warm.
Melt remaining 3 tablespoons of butter in a saucepan over medium-low heat; add flour, salt, pepper and mustard. Add reserved liquid and milk. Stir until thick and bubbly.
Pour over stuffed flounder rolls.
Sprinkle with Parmesan and paprika just before serving.