- Combine the regular mustard, mustard powder, and cayenne pepper in a small bowl. 
- Mix these dry ingredients well for a balanced flavor. 
- Add the soy sauce, corn syrup, and white vinegar. 
- Stir the mixture until smooth, ensuring everything is well incorporated. 
- Whisk in the mayonnaise and sugar. 
- Make sure all the ingredients are blended for the perfect consistency. 
- Heat the mixture in the microwave for about 15 seconds. 
- This helps meld the flavors together. 
- Stir again to ensure everything is mixed well. 
- Allow the sauce to cool. 
- Refrigerate it for at least four hours to let the flavors develop.