In a large pot over medium heat, combine turkey, stock, tinned tomatoes, green chillies, fresh tomatoes, onion, garlic and lime juice. Season with chilli, cumin, salt and pepper. Bring to the boil, then reduce heat and simmer 15 to 20 minutes.
Stir in avocado and coriander, and simmer 15 minutes, until slightly thickened. Spoon into serving bowls, and top with grated cheese.