Flank Steak with Caramelized Onions & Goat Cheese

1 cup olive oil
5 Tb balsamic vinegar
2 Tb fresh thyme leaves
2 large garlic cloves
1 1 1/2-lbs. flank steak
1 large onion, sliced
1 cup crumbled chilled soft fresh goat cheese
8 cups arugula

Blend oil, vinegar, thyme, and garlic in blender until garlic is chopped; season dressing with salt and pepper. Place steak in 13x9x2-inch glass baking dish. Add 2/3 of the dressing; turn to coat. Cover and chill 30 minutes or over night!

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Meanwhile, in a fry pan heat some olive oil and cook the onions until caramelized and tender, stirring occasionally, about 15 minutes; set aside.

Preheat broiler.

With marinade still clinging to steak, broil steak to desired doneness, about 6 minutes per side for medium-rare. Let steak rest 5 minutes; slice thinly across grain on diagonal.

Place greens and dressing in a large bowl; toss with enough dressing to coat. Mound greens on large platter. Surround with steak; top with onions and sprinkle with goat cheese.