Step 1

Place the softened butter in a large mixing bowl and beat with an electric mixer until fluffy. Add the parsley, garlic, finely minced lemon zest, red pepper flakes, and black pepper. Squeeze one lemon half into the bowl (about 2 tablespoons). Beat again until well combined.

Step 2

Transfer the butter to an airtight container and refrigerate until firm, at least 2 hours. When ready to use, scoop the firm butter over hot steaks. If you have any butter leftover, it's delicious on bread or tossed with hot vegetables.