Place the chicken stock, white wine, and saffron in a medium saucepan and bring to aboil. Add the mussels and stir. Place a lid on the pot and cook for 3 minutes or until mussels have opened. Turn heat off and remove mussels to a plate, reserving cooking liquid.
Season chicken with salt and pepper. Heat a large non-stick saute pan over high heat. When hot, add 1 teaspoon oil and the chicken. Saute for 6-7 minutes or until chicken is cooked through. Reserve chicken. Do not wash the pan.
Add another teaspoon of oil to the pan. Season shrimp with salt and add to the hot pan, sautéing for a few minutes until cooked through. Reserve shrimp.
Add the final teaspoon of olive oil to the saute pan along with the garlic. After one minute add the dried thyme and smoked paprika. Stir, then add the bell pepper, sautéing for 1 minute.
Add the tomato, cauliflower, and peas, stirring well to combine.
Add the reserved mussels, chicken, and shrimp, plus all of the reserved cooking liquid.
Turn heat up and cook for 5 minutes so that all the flavors have a chance to meld and all the meat is heated through.
Garnish with lemon slices.