1. Season the turkey pieces with a mixture of garlic, salt and pepper to taste, and vinegar. Marinate for 1 hour. Heat the oil in a heavy casserole large enough to hold the turkey and sauté the pieces 2-3 at a time until lightly browned. Add the marinade, tomato puree, stock, wine and pepper; cover and cook for 1 hour.
2. Add the olives, capers and potatoes and cook for half an hour longer, or until tender. Add the peas and cook 5-7 minutes.