“Premium Steak Sauce 250 g” is a generic description for various commercially available or homemade steak sauces packaged in a 250-gram (or 250 ml) container. It is not a single, specific, universally standardized product. 
Common characteristics of premium steak sauces include:
Flavor Profile: They are typically savory, rich, and can range from tangy or sweet to peppery and spicy, often with a depth of flavor from spices and ingredients like tomatoes, vinegar, Worcestershire sauce, and sometimes alcohol (e.g., Irish stout or whiskey).
Ingredients: Quality versions emphasize natural, high-quality ingredients, avoiding artificial colors or flavors. Specific ingredients vary widely by brand and style (e.g., some contain mushrooms and mustard for a Steak Diane style, others emphasize pepper or a smoky BBQ flavor).
Usage: They are versatile and can be used as a condiment for various meats, a marinade, a glaze during barbecuing, or a flavor enhancer for other dishes like burgers, chicken, and roasted vegetables.
Packaging: The 250g weight usually refers to the net weight of the product in a bottle or jar. 
Examples of brands that offer a 250g/250ml premium steak sauce include:
Ballymaloe Steak Sauce with Irish Stout: A product made in Ireland, known for its authentic taste, combining tomatoes, spices, and Irish stout.
Nando’s Prego Steak Sauce: A creamy Portuguese sauce with vinegar, garlic, spices, parsley, and Peri-Peri (African Bird’s Eye Chilli).
Kuehne Steak Sauce Peppery Piquant: A German-made peppery and piquant sauce. 
To find out about a specific “Premium Steak Sauce 250 g,” you would need to know the brand name, as the contents, flavor, and specific ingredients will depend on the manufacturer.