Preheat the oven to high temperature (broil) to heat the top grill of the oven.
Prepare the sauce. Finely chop the shallots and place them in a pan with the wine and vinegar. Wait for it to boil over medium heat for 5 minutes until evaporated. Add the cream and bring to a simmer for 2-3 minutes. Add a few pieces of cold butter and whisk together. Before adding more butter, ensure that the previous piece has melted.
Transfer the sauce to a bowl and add the mustard, stir, and season with salt and pepper.
Place the fish fillets on a baking sheet lined with parchment paper, and brush them with olive oil. Sprinkle with salt and pepper. Cook in the oven at the highest temperature for 5-6 minutes until cooked through.
Nutritional Information
* * Information per 100g serving, percentage of daily values based on a 2,000 calorie diet.
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