Combine steak marinade ingredients in a plastic storage bag. Mix and place steak into bag. Marinate for 30 minutes to 2 hours.
Combine salad dressing ingredients.
When steak is finished marinating, heat the grill to medium-high. Cook steak about 3 minutes per side for medium rare. Cool slightly, then cut steak against the grain into thin slices.
Toss salad greens in three-fourths of the salad dressing. Mound tossed salad on a platter (or on individual plates), then place sliced steak on top of salad. Pour remaining salad dressing over the top.
Sprinkle green onions over the salad, and add cherry tomatoes if desired. Makes 4 servings.