Ingredients:

  • 3 tablespoons red wine vinegar
  • 2 tablespoons yellow miso paste
  • 1 tablespoon packed brown sugar
  • 1/8 teaspoon cayenne pepper
  • 2 cloves garlic, finely minced
  • 1 (1 1/2-pound) skirt steak, cut into 4 pieces
  • freshly ground black pepper to taste