Beef Burger Caramelized Onions (Printable)
Juicy beef burger topped with caramelized onions, sautéed mushrooms, melted cheese, and fresh buns.
# What You Need:
→ For the Burgers
01 - 1 lb ground beef (80/20 blend recommended)
02 - 1 tsp kosher salt
03 - ½ tsp freshly ground black pepper
04 - 1 tsp Worcestershire sauce
→ For the Caramelized Onions
05 - 2 large yellow onions, thinly sliced
06 - 1 tbsp unsalted butter
07 - 1 tbsp olive oil
08 - ½ tsp sugar
09 - Pinch of salt
→ For the Sautéed Mushrooms
10 - 8 oz cremini or white mushrooms, sliced
11 - 1 tbsp unsalted butter
12 - 1 clove garlic, minced
13 - Salt and pepper, to taste
→ For Assembly
14 - 4 burger buns, toasted
15 - 4 slices Swiss or provolone cheese
16 - 2 tbsp mayonnaise (optional)
17 - 4 lettuce leaves (optional)
18 - 4 tomato slices (optional)
# How-To:
01 - In a large skillet over medium heat, combine butter and olive oil. Add onions, sprinkle with sugar and a pinch of salt. Cook, stirring occasionally, for 20–25 minutes until deep golden brown and very soft. Remove from skillet and set aside.
02 - In the same skillet, add butter and mushrooms. Cook over medium-high heat for 5–7 minutes until browned and tender. Add garlic, cook for 1 more minute, and season with salt and pepper. Set aside.
03 - In a bowl, mix ground beef with salt, pepper, and Worcestershire sauce. Form into 4 equal patties, slightly larger than the buns.
04 - Heat a grill or skillet over medium-high heat. Cook patties for 3–4 minutes per side for medium doneness. During the last minute, place a cheese slice on each patty and cover to melt.
05 - Lightly toast burger buns on the grill or in a toaster.
06 - Spread mayonnaise on the bottom buns if desired. Add lettuce and tomato, then the beef patty. Top with caramelized onions and mushrooms. Finish with the top bun.
# Expert Tips:
01 -
- The onions transform into something almost candy like, a sweet contrast to the rich beefy patty
- Mushrooms add an earthy depth that makes every bite feel restaurant quality
02 -
- Caramelizing onions takes patience and cannot be rushed without sacrificing flavor
- Letting patties rest for a couple minutes after cooking keeps juices inside
03 -
- Make extra onions and mushrooms because they disappear quickly
- A splash of balsamic vinegar in the onions adds complexity