1Heat coals or gas grill for direct heat. In tightly covered container, shake all dressing ingredients; reserve 1/4 cup.
2Cover and grill beef over medium heat 15 to 20 minutes, turning once, until desired doneness. In medium bowl, toss bell pepper and mushrooms with 2 tablespoons of the dressing; place in grill basket. Cover and grill vegetables 5 minutes, shaking grill basket to turn vegetables occasionally, until bell pepper is crisp-tender.
3Sprinkle beef with salt and pepper; cut into 1/4-inch slices. Toss beef and reserved 1/4 cup dressing. In large bowl, place salad greens, vegetables and beef. Add remaining dressing; toss.