Spicy sauce is a members-only food and cooking ingredient. It is made by combining chopped garlic with Gnome spice. (Spice or Evil Dave's Spices do not work.) Doing so requires a Cooking level of 9 and grants 25 Cooking experience.
As a food it heals 20 life points, but it is more commonly used with cooked meat to create chilli con carne at a Cooking level of 11. Doing so provides no experience but the chilli con carne may be combined with a potato with butter at level 41 to create a chilli potato for 15 experience.