Ingredients:
Burgers
908gr/2lbs medium ground beef
1/4 cup Guinness Barbecue Sauce
2 tsp steak spice
grapeseed oil for brushing burger patties (or other neutral tasting, high heat oil)
Sautéed Mushrooms and Onions
1 Tbsp grapeseed oil (or other neutral tasting, high heat oil)
1 small red onion, thinly sliced
227gr/8oz mushrooms, sliced
kosher salt and freshly ground pepper
Burger assembly
6 burger buns (brioche or potato buns recommended)
6 butter lettuce leaves
170gr/6oz Irish cheddar, sliced
12 slices cooked bacon
Guiness Barbecue Sauce (See link to recipe above)
Instructions
To make the burger patties
Find a baking sheet or large tray that will fit in your fridge, then line it with wax paper and set aside. Add the ground beef, Guinness barbecue sauce and steak spice to a large bowl and mix with your hands until just combined. Divide the meat mixture into 6 equal portions and gently form each portion into a patty that is about 5″ wide and 1/2″ thick. Lay the patties on the wax paper lined baking sheet and cover. Transfer the patties to the fridge to chill for 20 minutes. Preheat the barbecue to medium-hot.
To make the sautéed mushrooms and onions
While the burger patties chill and the barbecue pre-heats, sauté the onions and mushrooms: In a large skillet, heat the grapeseed oil over medium-high heat. Add the onions and sprinkle with 1/4 tsp kosher salt. Reduce the heat to medium and cook, stirring occasionally, until onions soften and start to caramelize, about 6 minutes. Add the sliced mushrooms to the skillet and season with an additional 1/4 tsp of kosher salt and freshly ground black pepper to taste. Cook the mushrooms with the onions, stirring frequently, until mushrooms are cooked and onions are silky soft, about another 3 minutes. Set aside and keep warm.
Grill the burgers
Remove the burger patties from the fridge and brush both sides with a light coating of grapeseed oil to help prevent sticking. Grill until cooked through, 3-4 minutes on each side. During the last minute of grilling, add cheddar slices to the top of each patty. Close the lid and let the cheese melt. Remove to a clean plate.
Assemble the burgers
Put the burgers on the buns, add the lettuce, some of the mushroom and onion mixture, bacon slices and drizzle with the Guinness Barbecue Sauce. Serve with extra Guinness Barbecue Sauce on the side.
Borrowed from: https://styleandgrace.ca/2025/03/07/guinness-bacon-burgers-with-mushrooms-and-irish-cheddar/