“Premium Normande Sauce 250 g” is likely a commercially prepared version of Sauce Normande (or Normandy sauce), a classic, rich, and creamy French sauce traditionally used for fish and seafood. The 250g refers to the product’s net weight. 

About Normande Sauce
Key Ingredients: The sauce is typically made from a base of fish velouté (one of the five French “mother sauces”), which is a fish stock thickened with a blond roux (butter and flour). Other primary ingredients include heavy cream, egg yolks (used as a liaison for thickening), and butter. Some versions may also feature white wine or cider, mushrooms, or oyster liquor.
Flavor Profile and Texture: It is known for its smooth, rich, and velvety texture. The flavor is a delicate balance of the fish stock and rich dairy products.
Pairings: It is a highly versatile sauce that pairs well with:Poached or baked fish, such as sole (as in sole à la Normande).
Various types of seafood.
Poultry, eggs, and vegetables.
Pasta dishes, like fettuccine. 
The “Premium” designation suggests it is a high-quality product, likely from a brand renowned for traditional French dairy or culinary products, such as those originating from the Normandy region of France.