In a small bowl, soak saffron threads in 2 tablespoons of warm seafood stock.
Heat olive oil in a small paella pan or skillet over medium heat.
Add sliced chorizo and cook until the fat renders and the edges are crisp.
Stir in diced onions and bell peppers, sautéing until softened and fragrant.
Add minced garlic, smoked paprika, sea salt, and black pepper, stirring for 30 seconds.
Pour in tomato puree and Bomba rice, stirring to coat the grains in the oil and spices.
Add the remaining seafood stock and the saffron-infused liquid; bring to a simmer.
Reduce heat to low and cook undisturbed for 10 minutes.
Nestle the shrimp and scrubbed mussels into the rice.
Cover and cook for another 5-7 minutes until the shrimp are pink and mussels have opened.
Remove from heat and let rest for 2 minutes to develop the socarrat bottom.
Garnish with fresh chopped parsley and serve with a lemon wedge.