It's obviously very strong Chookie and only small quantities are needed in recipes. Here's what I found
Use as a condiment with fish, chicken, meats or pasta.
Someone said 'I tend to use mushroom ketchup as an ingredient in meals. It has a similar texture to soy sauce.'
Delia Smith's cottage pieInformation from a commercially made Mushroom Ketchup site - this is probably the most useful
Pies & Puddings:
Add two tablespoons per 500g of meat to the fillings of steak and kidney pies and puddings to give them a spicy mushroom flavour and a rich colour.
Roast Meats & Poultry:
Mushroom Ketchup can be used as a marinate for all meats and poultry and also for basting during roasting. Use the resulting pan juices to make a rich dark gravy with the appetising smell and taste of mushrooms.
Sauces & Soups:
Enriches all brown sauces and soups and makes an excellent flavouring for cream of mushroom soup and mushroom sauce.
Straight from the bottle:
Mushroom Ketchup is delicious on grilled chops, kidneys, liver or steaks.
Nice with scrambled eggs apparently.
They say that it's good with melted butter on green vegetables, in soups, in steak or kidney pie, and good for adding to pan juices after cooking meat or fowl.
Minced Beef & Sweet Potato Stew