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