King Salmon with Savory Whipped Cream

NYT cooking King Salmon with Savory Whipped Cream 2 pounds king salmon fillet (skin off)salt and pepper3/4 cup heavy cream2 teaspoons dijon mustardPinch of cayenne1/2 teaspoon lemon zest1 tablespoon snipped chives2 tablespoons butterTarragon leaves (for...