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 and soften the sliced 1/2 onion, sliced 1/2 green bell pepper, and sliced 1/2 red bell pepper for 3-4 minutes. Add the sliced 4 garlic cloves, cook for 1-2 minutes.
Pour in the 1 cup 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. Simmer until the saffron starts to dissolve and liquid simmers lightly.
Add the halved (if big) 1/2 cup grape tomatoes and 2 pounds PEI mussels. Cover and steam for 4-5 minutes or until mussels open.
Transfer to the mussels and broth to a large bowl for serving, spoon the sauce over the mussels as you transfer. Serve with fresh bread slices.
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