In medium bowl, whisk together mayonnaise, Dijon mustard, and yellow mustard until smooth
Add honey and whisk vigorously until fully incorporated
Add curry powder, vinegar, garlic powder, onion powder, paprika, turmeric, salt, pepper, and cayenne if using
Whisk thoroughly 1-2 minutes until all spices evenly distributed and no clumps remain
Check consistency—should be thick and creamy but pourable
Taste and adjust seasoning with more honey, mustard, or curry powder as desired
Cover and refrigerate minimum 30 minutes before serving for best flavor
Stir well before using
Store in airtight container refrigerated