For the Rub:
Combine sea salt, black pepper, onion powder, granulated garlic, paprika (optional but recommended) and cayenne pepper.
For the Honey Mustard Sauce:
Combine the honey, dijon mustard, whole grain stone ground mustard, soy sauce, dried tarragon (2 Tbs if using fresh tarragon) and freshly minced ginger. Mix well. Refrigerate.
Rub steak with salt mixture. Let stand 30 minutes. Grill according to deisred degree of doneness. Serve with honey mustard.