A popular dipping sauce for french fries in heavily Mormon-influenced areas of the intermountain West, compounded of mayonnaise and ketchup with sundry other flavorings. 'Official' recipes promote a two-to-one ratio of mayonnaise to ketchup, but I confess I like a one-to-one better. Also, the brighter and fresher the flavor of your mayonnaise, the better it will be; I probably would not have gotten hooked were it not for trying it in Ukraine, where the mayo is oh-so-fresh.

According to legend, the original Arctic Circle fry sauce recipe was made tangy by the addition of pickle juice. I've seen recipes since that used lemon juice (half a lemon in three cups sauce). Spices and flavorings are at your discretion; I've seen a suggestion (that I rather like) to use prepared horseradish (at a ratio of 4 teaspoons per cup of sauce). My own newly-discovered favorite thing is garlic vinegar (a teaspoon-plus in a cup of sauce), which doesn't make it taste explicitly garlicky, just deeper and more interesting. You notice the vinegar as much as the garlic, actually.