Heat olive oil in paella pan over medium heat. Add onion, garlic and pepper; cook and stir for a few minutes.Add chorizo sausage, diced chicken, and rice; cook for 2 to 3 minutes. Stir in 3 1/2 cups stock, wine, thyme leaves, and saffron. Season with salt and pepper. Bring to the boil, and simmer for 15 minutes; stir occasionally.
Taste the rice, and check to see if it is cooked.If the rice is uncooked, stir in 1/2 cup more stock. Continue cooking, stirring occasionally. Stir in additional stock if necessary: use up to 2 cups additional stock, 5 cups total. Cook until rice is done.
Stir in squid, tomatoes, and peas. Cook for 2 minutes. Arrange prawns and mussels on top. Cover with foil, and leave for 3 to 5 minutes.
Remove the foil, and scatter parsley over the food. Serve in paella pan, garnished with lemon wedges.
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