Can be prepared in 45 minutes or less but requires additional unattended time.

Ingredients

　　1 stick (1/2 cup) unsalted butter, softened

　　1 tablespoon English-style dry mustard

　　1 1/2 tablespoons fresh lemon juice

　　1 teaspoon Worcestershire sauce

　　1/8 teaspoon cayenne, or to taste

　　In a food processor or in a bowl with a whisk blend together the butter, the mustard, the lemon juice, the Worcestershire sauce, the cayenne, and salt to taste until the mixture is smooth. Transfer the butter to a bowl and chill it, covered, for 8 hours to let the flavors develop. Serve the mustard lemon butter on grilled fish or chicken.