Slice sausage in 1/4 inch slices; brown in wok or large skillet. Add onions when sausage is nearly done. Drain. Add tomatoes, zucchini, lemon juice, salt, Tobasco sauce and oregano. Cook, uncovered, for about 5 minutes, stiring frequently. Remove to serving plate; sprinkle with cheese. Serve with crusty Italian bread. Yield 4 servings.