In a large saucepan combine the chicken broth, coriander, salt, and black pepper. Bring to boiling; add green beans. Return to boiling; reduce heat. Simmer, covered, for 10 minutes. Add carrots, cauliflower, and sweet pepper. Return to boiling; reduce heat. Simmer, covered, for 4 to 5 minutes more or until vegetables are crisp-tender.
Using a slotted spoon, transfer vegetables to a serving bowl, reserving broth mixture in saucepan. Cover vegetables; keep warm.
In a small bowl stir together oregano, water, cornstarch, and lemon peel; stir into broth mixture in saucepan. Cook and stir over medium heat until slightly thickened and bubbly. Cook and stir for 2 minutes more. Stir in lemon juice. Pour thickened broth mixture over vegetables. Toss lightly to coat. Makes 6 servings.