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Recipe from Weber's On the Grill™: Steak & Sides by Jamie Purviance

Miso-Marinated Flat Iron Steaks with Shiitake Mushrooms

  • People

    Serves 4

  • Prep Time

    10 mins

  • Marinating Time

    1 to 2 h

  • Grilling Time

    6 to 8 mins

Serves 4
Prep Time
10 mins
Marinating Time
1 to 2 h
Grilling Time
6 to 8 mins

the Ingredients

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  • ¼ cup miso
  • ¼ cup junmai sake or light beer
  • 2 tablespoons hot water
  • 1 tablespoon packed light brown sugar
  • 4 garlic cloves, minced
  • 4 flat iron steaks, each 6 to 8 ounces and about 1 inch thick, excess fat and any gristle removed


  • 2 tablespoons unsalted butter
  • 2 tablespoons extra-virgin olive oil
  • ½ pound shiitake mushrooms, stems removed, or other Asian-style mushrooms, such as king, oyster, or enoki
  • 4 large garlic cloves, thinly sliced
  • ¼ teaspoon kosher salt
  • ⅛ teaspoon freshly ground black pepper
  • 1 teaspoon rice vinegar


  • 01 In a small bowl whisk the marinade ingredients. Place the steaks in a glass or stainless steel dish and pour in the marinade, turning the steaks to coat both sides. Cover and refrigerate for 1 to 2 hours, turning the steaks once or twice.
  • 02 Remove the steaks from the dish and discard the marinade. Allow the steaks to stand at room temperature for 15 to 30 minutes before grilling.
  • 03 Prepare the grill for direct cooking over medium heat (350° to 450°F). If you're using a charcoal grill, keep a small part of the charcoal grate clear of briquettes as a safety zone of indirect heat.
  • 04 Brush the cooking grates clean. Grill the steaks over direct medium heat, with the lid closed, until cooked to your desired doneness, 6 to 8 minutes for medium rare, turning once or twice (if flare-ups occur, move the steaks temporarily over indirect heat). Remove from the grill and let rest while you cook the mushrooms.
  • 05 In a large skillet over high heat on the stove, melt the butter with the oil. Add the mushrooms and spread them out in a single layer so that most of them are touching the bottom of the skillet. Cook without moving them for 2 minutes. Stir the mushrooms, and then add the garlic, salt, and pepper. Cook until the mushrooms are barely tender, 2 to 3 minutes, stirring two or three times. Add the vinegar. Mix well.
  • 06 Serve the steaks warm with the hot mushrooms.

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