Homemade mushroom ketchup in a plastic tub

Mushroom ketchup is a style of ketchup that is prepared with mushrooms as its primary ingredient. Originally, ketchup in the United Kingdom was prepared with mushrooms as a primary ingredient, instead of tomato, the main ingredient in contemporary preparations of ketchup. Historical preparations involved packing whole mushrooms into containers with salt. It is used as a condiment and may be used as an ingredient in the preparation of other sauces and other condiments. Several brands of mushroom ketchup were produced and marketed in the United Kingdom, some of which were exported to the United States, and some are still manufactured as a commercial product. (Full article...)