Heat the olive oil in a paella pan or wide skillet over medium heat.
Add the sliced chorizo and sauté for 2 minutes until the oils are rendered.
Add the diced onion and red bell pepper, cooking until softened and slightly caramelized.
Stir in the minced garlic, smoked paprika, and saffron threads, followed by the tomato puree.
Add the Bomba rice to the pan, stirring for 1 minute to ensure every grain is coated in the aromatic base.
Pour in the seafood stock and season with sea salt and black pepper.
Bring the liquid to a boil, then reduce to a steady simmer.
Arrange the shrimp, mussels, and cubed cod fillet on top of the rice in an even layer.
Cook undisturbed for 15 to 18 minutes until the liquid is absorbed and the rice is tender.
During the last 2 minutes of cooking, scatter the frozen peas over the top.
Increase the heat slightly for the final minute to develop the socarrat, or crispy rice crust, on the bottom.
Remove from heat and garnish with fresh parsley and a lemon wedge before serving.