Argentinean Barbecued Steak

INGREDIENTS

• 1/2 cup red wine vinegar
• 2 tablespoons fresh lemon juice (from 1/2 lemon)
• 3/4 cup chopped fresh flat-leaf parsley
• 3 tablespoons chopped fresh oregano leaves
• 2 garlic cloves, roughly chopped
• 1/3 cup olive oil
• 1/8 teaspoon red pepper flakes
• salt and pepper
• 3 lbs skirt steaks
• 3 tablespoons olive oil
• salt