Prepare tortellini according to package directions; drain and place in a bowl. Cover and refrigerate.
Place water in a large saucepan (with a steamer rack) over medium high heat and bring to boil. Add broccoli florets to rack, cover and steam 2-3 minutes or until bright green but still undercooked. Remove from heat and cool.
Remove tortellini from refrigerator and place in a large bowl. Combine tortellini, broccoli, tomatoes, carrots, feta, salad dressing and onions; stir gently until blended. Refrigerate until ready to serve.