Heat a large sauté pan or paella pan on high heat. Add the oil, yellow bell pepper, and yellow onion and allow to cook until golden and tender.
Add garlic to the pan, stir, and cook 2-3 minutes.
Add diced tomatoes and cook another 2-3 minutes. While this is cooking, add in smoked paprika, coriander, ancho chile, cumin, turmeric, and saffron. Stir and allow spices to toast briefly for 2 minutes. Quickly stir in ¼ cup water. This will create your Sofrito.
Add grated cauliflower to pan and stir. Allow to cook about 3 minutes. Add in peas and stir.
Turn the heat down to medium.
Evenly spreading your proteins on top of the cauliflower and Sofrito, add the shrimp, scallops, salmon, and mussels. Cover with a lid and allow to cook about 5 minutes. Be sure shrimp is cooked through and is pink.
Garnish the top with chopped cilantro and green onions.
Serve with lemon and lime wedges on the side.