Dice tomato, salt lightly, sprinkle with basil, and set aside. Sauté onions and garlic in a little olive oil. Add tomatoes, mushrooms, spinach, and lemon juice and sauté for 3 minutes. Remove from pan, set aside, and reserve. In the same pan, heat olive oil and butter on high heat. Add cod and fry on high heat until golden brown on one side. Turn and fry 1 minute more. Reduce heat, add the vegetables, soy sauce, salt and pepper, and sauté for another 3 to 4 minutes. Serve over rice, and raise a toast to Gloucester hospitality! Serves three.