Miso Butter Steaks with Shiitakes and Broccoli | America's Test Kitchen

Ingredients

• 6 tablespoons unsalted butter, softened, divided
• 1 1/2 tablespoons red miso
• 4 (6- to 8-ounce) center-cut filets mignons, 2 inches thick, trimmed
• 1 3/4 teaspoons table salt, divided
• 1/2 teaspoon pepper
• 1 pound shiitake mushrooms, stemmed and sliced thin
• 1 pound broccoli florets, cut into 1½-inch pieces
• 2 garlic cloves, minced
• 1 tablespoon sesame seeds, toasted