Prep Time: 10 minutes
Cook Time: 12 minutes
Ingredients:
- 1 1/4 pounds flank steak
- 3 medium onions, cut into 1/2-inch slices
- 1/4 cup balsamic vinegar
- 2 teaspoons Dijon mustard
- 1 teaspoon salt
- 1 teaspoon rosemary, crumbled
- 1 teaspoon olive oil
By Derrick Riches, About.com Guide
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