01 - In a medium bowl, mix softened butter, minced garlic, chopped parsley, lemon juice if using, salt, and black pepper.
02 - Stir thoroughly with a spatula or fork until the mixture is smooth and evenly combined.
03 - Taste and modify salt or pepper as preferred.
04 - Transfer the mixture onto parchment paper or plastic wrap, roll into a log, twist ends to seal, or place in an airtight container.
05 - Refrigerate for at least 1 hour to let flavors meld.
06 - Use as a spread on warm bread, melted over steaks, or stirred into cooked vegetables or pasta.