Savory London Broil with Sweet Braised Shallots and Mushrooms - Meat - Kosher Recipe

Ingredients

• 1 (2- to 4-pound) London broil or minute steak, split, and deveined (this recipe can also be made with 2 smaller (11/2- to 2-pound) London broil)
• 1 head garlic, roasted (instructions below)
• 1 tablespoon onion powder
• 1/2 teaspoon ground black pepper
• 1 teaspoon kosher salt
• 2 tablespoons packed light brown sugar
• 3 tablespoons extra-virgin olive oil
• 6 shallots, sliced
• 11/2 pounds button or assorted mushrooms
• 1/3 cup balsamic vinegar
• 3 tablespoons soy sauce
• 2 tablespoons sugar
• 1/2 teaspoon kosher salt
• 1/4 teaspoon ground black pepper