Make a sofrito by gently sautéeing onion, diced red peppers, and garlic in olive oil for about 10-15 minutes, being careful not to brown it. Add chorizo and pimentón. Sauté until sausage is cooked and lightly colored. Add tomatoes, parsley, and saffron.
When heated through, add the rice and cook for about 5 minutes, until the rice has changed color. Then add the broth and cook, without stirring, for about 12 minutes.
Once the rice is nearly cooked, add the fish, as well as the clams and mussels, hinge-side down in the hot rice.
Without disturbing the rice too much, check the bottom layer of rice to ensure that the crispy, toasted socarrat has formed. If it hasn't, pull some of the hot coals forward and place the paella directly on the coals for a couple of minutes. Be attentive that the bottom doesn't burn.
Embellish the paella with the roasted red pepper strips and Italian parsley. Allow the paella to rest for a couple of minutes before serving, garnishing with lemon wedges. Allow it to rest for a bit (5-15 minutes,) and serve while still warm
Spanish tradition has this dish served straight from the pan on a round table family style. It is usually eaten right out of the pan using a spoon, and not on plates. This way, you don't disturb the structure of the rice too much by agitation. Guests start at the perimeter of the Paella, all eating the triangle in front of them, and work toward the center of the pan.