Steamed Beer Mussels With Chorizo

Name: Steamed Beer Mussels With Chorizo
Ingredients: 2 pounds fresh, live mussels; 1 tablespoon olive oil; ½ yellow onion (chopped); 1 pound ground chorizo; 1 tablespoon tomato paste; ½ teaspoon ground cumin; ½ teaspoon dried oregano; ½ teaspoon smoked paprika; Pinch of cayenne pepper; 3 garlic cloves (grated or minced); 12 ounces pilsner; 1 (14-ounce) can of diced tomatoes; 1 cup chicken stock; 1 lime (juiced); 2 tablespoons chopped fresh cilantro; 1 tablespoon butter; Crusty bread (for serving)