Mix everything together well. Don't worry if it looks a little grainy at first from the Worcestershire sauce. If you mix it well enough, it will become creamy.
Refrigerate for at least 30 minutes before using, and enjoy!
Notes
Use high-quality mayonnaise.
Experiment with different mustards.
Adjust the ratio of mayo and mustard to your preference.
Chill before serving for best flavor.
Add a personal touch! Consider stirring in some of your favorite spices.
Nutritional values are for an entire cup of mayo mustard sauce.