Most base gravies no matter what you put in them IE, Cabbage, Carrot etc doesnt make to much difference, The way Takeaways and restaurants get that elusive flavour is all down to the mix powder, Having been in a few kitchens Ive found it very difficult to try and get a recipe for the mix powder they use, When i asked them it was just a no no, If the mix powder can be cracked you will get the elusive taste thats missing,