It is typically served as a topping for grilled steaks or burgers, but is also used as a marinade, a dipping sauce for onion rings and chips, or on roasted potatoes.
Then, the addition of onions, vinegar, garlic and Worcestershire sauce, gives it a savoury-sweet flavour.
There was speculation at the time that monkey glands could slow down ageing.
[4] A more outlandish theory is that it was named after Russian-born French scientist, Dr Serge Abrahamovitch Voronoff, who was a regular visitor at the Savoy Hotel in London.
One of his medical experiments involved grafting monkey testicle tissue onto impotent men as a cure.