Heat a large skillet or cast iron pan over medium-high heat. Sear the sliced 4 links chorizo or andouille sausage until nicely browned and fragrant on both sides. Remove and set aside.
In a large pot or Dutch oven, combine, melt the 4 tablespoons unsalted butter, 1 cup dry white wine or sparkling wine, 1/2 cup water, 1/2 teaspoon coarse kosher salt, 1/2 teaspoon ground black pepper, and 1 pinch saffron. Bring to a simmer and allow the saffron to bloom.
Add the sliced 1/2 onion, 1/2 green bell pepper, 1/2 red bell pepper, 4 garlic cloves and 1/2 cup grape tomatoes to the pot and top with the 2 pounds PEI mussels. Cover and steam for 4-5 minutes or until mussels open, opening to rotate, if needed. Add the cooked chorizo back to the top of the pot, covering and cooking for 1 more minute.
Transfer to the mussels and broth to a large bowl for serving, spoon the sauce over the mussels as you transfer. Finish with a spritz of fresh lemon juice. Serve with crusty bread, over pasta or rice.
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Notes
How Long To Steam Mussels
1 lb mussels: ~3–4 minutes
2 lbs mussels: ~4–6 minutes
3 lbs mussels: ~6–8 minutes
Storage & Leftovers
I recommend preparing mussels right before serving. They get rubbery and dry when made ahead of time or when reheating leftovers. Cooked mussel meat can be removed from the shell and frozen in an airtight plastic bag for up to 3 months. Thaw overnight in the refrigerator and use in a recipe that calls for cooked mussels.