Combine all ingredients in a medium to large bowl. Note: Tarragon has a strong taste, so this is an optional ingredient based on your taste preferences.
Mix to thoroughly combine.
Refrigerate until ready to serve.
Serve in a sauce bowl alongside crab cakes.
Notes
NOTES:
Use any type or brand of mayo that you prefer except for pre-spiced mayonnaise.
Swap green onions, scallions or chopped white, red or Vidalia onion.
Fresh tarragon has a very distinct, somewhat strong flavor. This is an optional ingredient based on your taste preferences.
You can swap yellow mustard or creole mustard for Dijon mustard.
Capers are like tiny green, salty olives that add flavor to your sauce.
Ground red pepper is optional. I use Old Bay Seasoning on my crab cakes which already has red pepper in it.