Steakburger PT50M https://img1.recipesrun.com/201907/2019/1028/72/9/153142/300x200x90.jpg This luxe burger gets its umami-packed richness from dry-aged steak. Yep, you read that right, we grind beautiful steaks to make a burger. One bite of the juicy patty, steak sauce–flavored onions, and rich herb butter (inspired by Béarnaise sauce, a classic steak condiment) and you'll know it's worth every penny. 4 servings Ingredients: Romaine or green leaf lettuce (for serving) 4 brioche or other high-quality hamburger buns 4 slices white cheddar cheese Kosher salt, freshly ground black pepper Neutral vegetable oil, such as grapeseed (for grill) 1 1/2 pounds dry-aged steak (such as rib-eye or New York strip; 20% fat), coarsely ground 1 tbsp. finely chopped tarragon or parsley 1/4 tsp. kosher salt 1/2 cup (1 stick) unsalted butter, room temperature 2 tbsp. finely chopped shallot (about 1 small shallot) 1/4 cup white wine vinegar 1 tbsp. light brown sugar 2 tbsp. unsalted butter 2 tbsp. white wine vinegar 3 tbsp. Worcestershire sauce 2 tbsp. tomato paste 1/4 tsp. freshly ground black pepper 1/2 tsp. kosher salt 2 medium onions, thinly sliced 2 tbsp. neutral vegetable oil, such as grapeseed