Trim any separable fat from meat. Thinly slice meat across the grain into bite-size pieces. In a 10-inch skillet heat oil; stir-fry meat for 2 to 3 minutes or until done. Remove meat from skillet.
Add onion and garlic to skillet; stir-fry for 1 minute. Stir in tomato paste, tomato juice, water, vinegar, oregano, cumin, and cinnamon. Add zucchini; bring to boiling. Reduce heat; cover and simmer for 5 minutes or until zucchini is tender. Return meat to skillet; heat through. Serve over hot cooked orzo or other pasta; sprinkle with feta cheese and, if desired, walnuts or parsley. Makes 4 servings.