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