Prep all ingredients.
In a large pot over medium heat, melt butter. Add garlic and let sizzle for 30 seconds. Stir in lemon zest and red pepper flakes for 45 seconds.
Pour wine into the pot, season with black pepper, and bring to a boil. Submerge mussels in the sauce and cover immediately. Boil for 1 minute before stirring mussels.
Replace pot lid and continue boiling for 2 more minutes until shells start opening. Stir in parsley, cover again, and cook until all shells are open, 1 to 3 minutes.
Serve and relish!
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