Then add remaining ingredients to the butter and mix well to combine (I use a fork for this).
2 teaspoon dijon mustard, 1 garlic clove, 2 teaspoon finely chopped chives, 1 cup flat leaf parsley, 1 teaspoon worcestershire sauce, 1 teaspoon lemon juice, 2 teaspoon finely grated parmesan cheese, ½ teaspoon fine salt, a few grinds of fresh black pepper