Cut the seitan into bite-sized cubes and slice the red bell pepper into thin strips.
Heat olive oil in a wide, shallow pan over medium-high heat. Add the seitan and bell peppers, searing until the seitan is golden and the peppers are slightly charred.
Add the diced onion and minced garlic to the pan, sautéing for 2-3 minutes until fragrant and translucent.
Stir in the Bomba rice and smoked paprika, coating the grains in the oil and spices for 1 minute.
Pour in the tomato puree, vegetable broth, and saffron threads. Stir once to distribute the ingredients, then bring to a boil.
Reduce the heat to low and simmer undisturbed for 15-18 minutes. Do not stir the rice; this allows the 'socarrat' (a delicious crispy crust) to form on the bottom.
During the last 5 minutes of cooking, scatter the chickpeas and green peas over the top of the rice to steam.
Once the liquid is absorbed and the rice is tender, remove from heat. Season with sea salt and black pepper.
Garnish with fresh chopped parsley and serve with a lemon wedge to brighten the smoky flavors.