Easy One Pot Chicken and Chorizo Paella

Name: Easy One Pot Chicken and Chorizo Paella
Ingredients: 1.2 litres hot chicken stock ((I used 2 Kallo organic chicken stock cubes)); Pinch saffron; 2 tablespoons olive oil; 1 onion (sliced); 100 g chorizo (sliced or diced); 400 g chicken thigh fillets (no bone or skin, cut into 2cm chunks); 3 cloves garlic (crushed or grated); 1 teaspoon dried chilli flakes ((or to taste)); 3 teaspoons smoked paprika; 1 red pepper (sliced); 2 medium tomatoes (roughly chopped); 300 g paella rice; Salt and pepper; 100 g frozen peas; 2 lemons (cut into quarters); 2 tablespoons chopped parsley (plus extra for garnish)