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French Onion Burger

French Onion Burger

The French Onion Burger, a delectable fusion of classic American comfort food and the rich flavors of French cuisine. This mouthwatering burger is a true delight for burger enthusiasts and food connoisseurs alike. Picture a juicy, flame-grilled beef patty topped with a generous layer of caramelized onions, infused with savory onion soup broth and a hint of sweetness. Your guests will be thrilled to come back in to enjoy this burger.



·       1 lb. Mill Street Local Beef - SGC# 215000

·       1 1-ounce envelope onion soup seasoning mix

·       1 tablespoon Worcestershire sauce

·       1/2 teaspoon Morton coarse kosher salt

·       for serving: toasted bun, gruyere cheese of choice, crispy baconcaramelized onions (below), lettucetomatomustardketchupDijonnaise (below), etc.

for the caramelized onions

·       2 large sweet onions, thinly sliced

·       1 tablespoon olive oil

·       1 tablespoon unsalted butter

·       1/2 teaspoon Morton coarse kosher salt

·       1 teaspoon balsamic vinegar

for the Dijonnaise (optional):

·       1/3 cup high-quality mayonnaise

·       2 tablespoons Dijon mustard

·       1 clove garlic, finely chopped or grated

·       Morton coarse kosher salt & ground black pepper, to taste



1.    Prep: Prepare the grill for medium-high direct grilling, 450-500 degrees F. Prep any toppings & condiments as desired (see below). 

2.    Mix & form the burger patties: Add the ground beef, onion soup seasoning mix, Worcestershire sauce & kosher salt to a large mixing bowl. Using your hands, mix just until well combined. Be careful not to overmix as it yields a dryer, tougher burger. Divide the mixture into 4 equal portions. Press each portion into a 1-inch thick burger patty. Use your thumb to press a slight indent in the center of each burger patty. 

3.    Grill the burgers: Place the burger patties on the grill grates, directly over the flame. Grill 3 minutes per side for medium doneness. If you prefer a less/more done burger, grill for 1 minute less/more. If making a cheeseburger, add the cheese to the burger patties in their last minute of grilling. Toast the Burger Buns while you’re at it – see below!

4.    Serve the French onion burgers: Build your burgers as desired. At our house, the toasted St Pierre brioche buns get a quick schmear of Dijonnaise, topped with leafy lettuce, a French onion burger, crispy bacon, & caramelized onions. Serve immediately.

5.    Enjoy!