In a large pot or wok, melt the butter over a medium-high heat until it begins to foam. Add the chili flakes so the butter absorbs the heat. Add the garlic, onion, and tomato and cook until fragrant
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Add white wine and the mussels and cover so that they steam. About 4 minutes in, uncover and stir and then cover again. Taste the sauce and season with salt and pepper. Cook for another 4 or 5 minutes
Once the mussels have opened, they are ready to serve. Top with the chopped parsley. Enjoy with some hearty, crust bread to dip in, or heat up some pasta and enjoy with the broth