Paella mixta

Name: Paella mixta
Ingredients: 400g can chopped tomatoes; 600ml chicken stock; 1 heaped tsp smoked paprika; 2 pinches of saffron; 1 onion, chopped; 3 garlic cloves, crushed or finely chopped; 4 tbsp olive oil; 300g paella rice; 4 skinless, boneless chicken thighs, cut in half; 200g chorizo, sliced; 85g frozen peas; 150g raw king prawns, peeled if you like; 250g mussels, cleaned; 1 lemon, quartered (optional)