Heat olive oil in a paella pan or wide skillet over medium heat.
Sauté the sliced chorizo until the fat renders and it becomes slightly crisp.
Add the onion and red bell pepper to the pan, sautéing until softened and translucent.
Stir in the minced garlic, smoked paprika, and tomato puree, cooking for 2 minutes to create a thick, aromatic sofrito.
Add the Bomba rice to the pan, stirring for 1 minute to coat every grain in the oil and tomato mixture.
Pour in the seafood stock and saffron threads, then season with sea salt and black pepper.
Bring the liquid to a gentle simmer and distribute the shrimp, mussels, and squid rings evenly across the pan.
Cook undisturbed for 15 to 18 minutes until the liquid is fully absorbed and the seafood is cooked through.
Increase the heat to medium-high for the final 60 seconds to develop the toasted socarrat crust on the bottom.
Garnish with fresh parsley and serve immediately with a lemon wedge.