Cut the fish fillets in big cubes, season with salt and pepper. Coat the fish in flour from both sides. Shake well to remove excess.
4 Fish Fillet, Salt & Pepper, 2 tbsp. All-Purpose Flour
In a large frying pan, heat the vegetable oil and 1 tbsp of butter over medium heat. Don't let the butter burn. Add the fish fillets and cook for 3-4 minutes per side until golden brown and cooked through. Remove from the pan and keep warm.
1 tbsp. Butter, 1 tbsp. vegetable Oil
For the mustard sauce, combine the heavy cream, white wine, mustard, and white wine vinegar in a saucepan over medium heat. Simmer gently, stirring occasionally, until the sauce thickens. Season with salt and pepper to taste.
1 cup Heavy Cream, ½ cup White Wine, ¼ cup Whole Grain Mustard, 1 tbsp. White Wine Vinegar, Salt & Pepper