The term “Premium Corn Sauce 250 g” likely refers to premium corn starch (also known as corn flour) packaged in a 250-gram size, which is widely available from various brands as a thickening agent for sauces, gravies, and soups. 
Corn sauce, as a specific food product, is a fermented condiment with a savory taste used to flavor various dishes, similar to soy sauce. However, in common culinary contexts, “corn sauce” in product descriptions often indicates the use of corn starch powder to create sauces and gravies. 

Common Uses of Premium Corn Starch
Thickening Agent: It is an effective, lump-free agent for thickening soups, stews, gravies, casseroles, and dessert puddings, providing a clear, glossy finish.
Baking Essential: It helps to bind ingredients and lighten the texture of gluten-free cakes, cookies, and pastries, improving their overall consistency.
Frying Aid: When used as a coating, it creates an ultra-crispy, golden crust on fried foods like chicken or tempura without absorbing excess oil.
Gluten-Free Alternative: As it is naturally gluten-free, it is suitable for individuals with gluten sensitivities or celiac disease.