Mussels And Chorizo In Polenta Broth

Name: Mussels And Chorizo In Polenta Broth
Ingredients: 2 tablespoons of olive oil; 1 yellow onion, chopped; 8 ounces of Spanish chorizo, chopped (remove casings); 4-5 cups of high-quality chicken stock; 1/3 cup of dry white wine; 8 ounces of diced tomatoes in their juices; 1/2 teaspoon of crushed red pepper flakes, with more to taste; 3 cloves garlic, minced; pinch of saffron threads; 1/2 cup of polenta; salt and pepper, to taste; 1.5 lbs. mussels, cleaned and de-bearded; 1/2 cup Italian parsley, chopped (to serve)