French Onion Burgers

Ingredients

• 1.5 pounds ground beef 
• 6 ounces gruyère cheese shredded
• 4  hamburger buns split
• 4 servings kosher salt 
• 0.5 cup chicken broth low-sodium
• 2 tablespoons olive oil extra-virgin
• 1 large onion halved thinly sliced
• 1 teaspoon onion powder 
• 2 tablespoons parmesan cheese grated
• 0.5 teaspoon sugar 
• 2 tablespoons worcestershire sauce 

Equipment

• bowl
• frying pan
• baking sheet
• oven
• broiler
• broiler pan

Directions

1. Heat the olive oil in a large skillet over medium-high heat.
2. Add the onion and cook, stirring, until it starts to brown, 3 to 4 minutes.
3. Add the sugar and 1/2 teaspoon salt, reduce the heat to medium low and cook, stirring occasionally, until deep golden, 15 more minutes.
4. Add the chicken broth and 1 teaspoon Worcestershire sauce and simmer until the onion is tender and the liquid is almost evaporated, 8 minutes.
5. Preheat the broiler.
6. Mix the beef, onion powder and the remaining 2 tablespoons Worcestershire sauce in a bowl with your hands. Form into four 3/4-inch-thick patties and place on a broiler pan. Make an indentation in the center of each with your thumb; season the patties with salt. Broil, turning once, 5 minutes.
7. Place the buns cut-side up on a baking sheet.
8. Sprinkle with both cheeses and broil until melted, about 1 minute.
9. Spread mustard on the buns; sandwich with lettuce, the burgers and caramelized onion.
10. Serve with potato chips.
11. Photograph by Christopher Testani