|Place of origin||Netherlands|
|Serving temperature||With French fries|
Fritessaus or frietsaus ("fries sauce") is a Dutch accompaniment to French fries, served popularly nationwide. It is similar to mayonnaise, but with at most 25% fat, is leaner and usually sweeter than mayonnaise. Mayonnaise in the Netherlands is required by the Warenwet (Wares law) of 1998 to contain at least 70% fat and at least 5% egg yolk before it may be called mayonnaise.
Although it is usually bought pre-made, frietsaus can be produced at home in a process similar to that which is used to make mayonnaise. It is usually thinned with water or other suitable liquids.
Most recipes use lime juice. Chives and capers are common additions.