Place roast beef in large serving bowl. Pour dressing over beef; mix well. Let stand 10 minutes to marinate.
In medium saucepan, bring 4 cups water to a boil. Add carrots; return to a boil. Boil 2 minutes. Add pea pods; cook an additional minute.
Drain vegetables; immediately plunge into ice water to chill. Drain thoroughly; place vegetables in bowl with beef mixture. Add cucumber; toss lightly. Garnish with tomato wedges.