INGREDIENTS
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For the mustard-herb vinaigrette:
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1/3 cup balsamic vinegar
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1 1/2 Tbs. chopped fresh thyme
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1 1/2 Tbs. chopped fresh marjoram
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1 1/2 Tbs. Dijon mustard
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2 large cloves garlic, minced
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Salt and freshly ground pepper
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3/4 cup extra-virgin olive oil
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1 flank steak, about 1 1/2 lb. and 1 to 1 1/2 inches thick
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1 red onion, cut into wedges
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1 large head romaine lettuce, leaves torn into bite-sized pieces
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2 to 3 tomatoes, preferably heirloom, cut into wedges, plus a handful of mixed cherry tomatoes, halved