Burger au Poivre with Mushroom-Merlot Gravy
*TEST KITCHEN TIP:
The internal color of a burger is not a reliable doneness indicator. A beef, veal, lamb, or pork patty cooked to 160°F is safe, regardless of color. To measure the doneness of a patty, insert an instant-read thermometer through the side of the patty to a depth of 2 to 3 inches.