Jalapeno fry sauce is great on french fries, chips, burgers, chicken sandwiches, onion rings, and so much more.
Combine the mayonnaise and ketchup in a small container or bowl with a lid.
Chop the jalapeno into small pieces. Add to the mayonnaise/ketchup mixture.
Stir until all of the ingredients are combined.
Cover sauce with a lid and let it refrigerate 2 hours or overnight before serving.