1. Heat the oil in a large, heavy saucepan and saute the beef until it is lightly browned. Push to the side and addonion and garlic. Sauté onion until soft. Add tomatoes and cook 5 minutes. Add oregano, bay leaf, sugar, tomato paste, salt and pepper to taste, broth, and wine. Cover and simmer for 1 1/2 hours, or until the meat is almost tender.
2. Add sweet potatoes and potatoes and a little more stock and wine if necessary to cover. Simmer for 10 minutes, then add the squash and peaches, and simmer for 10 minutes. Add the corn and cook 5 minutes, or until all the ingredients are tender.