You may have seen our YouTube video on how to make mushroom ketchup. Mushroom ketchup was a very popular condiment and cooking seasoning in the 18th century. Add it to soups and stews, or pour it over a finished dish or roasted meat. We were so impressed with how much Geo Watkins Mushroom sauce tastes just like the old recipes we’ve researched, that we decided to add it to our catalog. Comes in 190ml (6.4 oz) bottles. If you haven’t tried an authentic mushroom ketchup, you really need to try this! Allergy precautions: barley gluten. Imported from Great Britain.