~French Bistro Burgers~ YIELD: 4 servings PREP TIME: 15 minutes COOK TIME: 8 minutes TOTAL TIME: 28 minutes **Ingredients** FOR THE BURGERS: 1 to 1 1/2 pounds ground chuck (80% lean)~ Truffle salt or kosher salt~ Freshly ground black pepper~ 4 slices brie cheese~ FOR THE GARLIC MAYONNAISE: 1/4 cup mayonnaise~ 1 garlic clove, minced~ 1 tablespoon fresh lemon juice~ 1/4 teaspoon kosher salt~ 1/4 teaspoon ground black pepper~ FOR FINISHING: 2 cups arugula~ **1/2 cup caramelized onions ( instructions below)~ 4 burger buns, toasted if desired. ,**Directions** For the burgers: Divide the meat into four equal potions. Form each portion loosely into a disk shape, making a deep impression in the center with your thumb. Season both sides of each burger to taste with salt and pepper. Prepare and preheat a grill, grill pan, or cast iron griddle. Cook the burgers until slightly charred and cooked through, about 5 minutes per side. If using very fresh and high quality ground beef, feel free to cook to medium or medium-rare, about 3 to 4 minutes per side. Remove the burgers from the heat and add the brie cheese. Tent with aluminum foil and allow the burgers to rest for 5 minutes, or until the juices are redistributed and the cheese is melted. For the garlic mayonnaise: Combine all the ingredients in a small bowl and refrigerate until ready to use. To finish: Top each burger with arugula and caramelized onions. Spread garlic mayo on each burger bun and sandwich the burgers. Serve immediately. ** Caramelized onions in the slow cooker: place 4 to 5 large onions, sliced, in a slow cooker with 3 tablespoons butter or olive oil and 1/2 teaspoon salt. Cook on LOW for 10 hours. Refrigerate or freeze the onions.