Heat the olive oil in a paella pan or wide skillet over medium heat.
Add the diced Spanish chorizo and sauté until the fat renders and the edges are slightly crisp.
Stir in the diced onion and red bell pepper, cooking for 3-4 minutes until the vegetables have softened.
Add the minced garlic and smoked paprika, stirring constantly for 30 seconds until fragrant.
Add the Bomba rice and tomato puree to the pan, stirring to ensure every grain of rice is coated in the oil and spices.
Pour in the chicken bone broth and sprinkle the saffron threads, sea salt, and black pepper over the mixture.
Bring the liquid to a boil, then immediately reduce the heat to a low simmer.
Allow the rice to cook undisturbed for 12-15 minutes; do not stir the rice, as this prevents the formation of the traditional crusty bottom.
Once most of the liquid has been absorbed, arrange the shrimp and scrubbed mussels on top of the rice, pressing them down gently.
Cover the pan with a lid or foil and cook for an additional 5-8 minutes until the shrimp are pink and the mussels have opened.
Increase the heat to medium-high for the final 60 seconds to develop the 'socarrat' or toasted rice layer on the bottom.
Remove from heat, garnish with fresh parsley, and serve with a fresh lemon wedge.