Combine all the dressing ingredients in a bowl and whisk well. Store in the refrigerator until needed.
For the salad bowls
Preheat the grill to 450F.
Dry the streak and season well with salt and pepper.
Thread the cherry tomatoes and red onion chunks onto skewer. Brush with oil and season with salt and pepper.
When the grill is ready, add the steak and toamtoe/onion skewers. Grill the vegetables turning occassionally for 5-8 minutes until the onions begin to soften and the tomatoes start to blister. Remove the vegetable skewers and set aside to keep warm.
Grill the steak for 4 to 5 minutes per side for medium rare or a minute longer per side for medium.
Remove the steak to a cutting board and tent it with foil for 10 minutes. Slice the steak thinly against the grain.
While the seatk is resting divide the chopped romaine lettuce between 4 serving plates. Top with the sliced steak, the grilled vegetables. Top with1/4 cup of hummus per plate, chopped cucumber chunks, olive and feta cheese crumbles.
Drizzle with the herbed yogurt dressing. Garnish with lemon wedges and mint leaves.