• 3 tablespoons soy sauce
• 2 tablespoons honey
• 2 tablespoons Chinese black vinegar (or balsamic vinegar)
• Freshly ground black pepper
• 2 cloves garlic, chopped
• 2 tablespoons cooking oil
• 1 1/2 pounds skirt steak, cut into 6-inch pieces

Place all ingredients, including the steak, in a large, zip-top plastic bag.

Squeeze all the air out of the bag and seal. Massage the steak to get it nice and cozy with the marinade. Let marinate at least 30 minutes or overnight in refrigerator.

source: http://steamykitchen.com/blog/2009/01/04/skirt-steak/