In a medium mixing bowl, combine the butter, lemon, garlic, parsley, chives, mustard, salt, paprika, red pepper flakes and cayenne pepper. This works best to mash with a fork or the back of a spoon. You can also combine it using a paddle attachment on a stand mixer.

Place the butter in an airtight container or roll into a log on parchment or wax paper and refrigerate for 1 hour before using.

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