Heat grill to high.
Grill steak 4 minutes per side for medium-rare. Let rest 5 minutes; slice thinly.
Place lemon juice, lemon zest, mustard, and oil in a jar with a lid. Close tightly and shake vigorously to combine. Place greens in a large mixing bowl, add 2 tablespoons of the dressing, and toss to coat. Divide greens among 4 serving plates, top with steak, tomato wedges, onion, and feta, and serve.
Nutritional Information:
420 calories
25 g fat
9 g saturated fat
42 g protein
7 g carbohydrate
2 g dietary fiber
380 mg sodium
