Caramelized Onion Burger with Sweet Peppers

This juicy caramelized onion burger features caramelized onions and sweet peppers packed both inside the burger for extra flavor and more piled on top with a slice of pepperjack cheese and crisp lettuce.

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Caramelized Onion Burger with Sweet Peppers

This juicy caramelized onion burger features caramelized onions and sweet peppers packed both inside the burger for extra flavor and more piled on top with a slice of pepperjack cheese and crisp lettuce.

Prep Time 20

Cook Time 1

Total Time 1 20

Servings servings

Calories 590kcal

Ingredients

2 tablespoons unsalted butter, divided
1 large sweet onion, thinly sliced
2 medium cloves garlic, minced
1 tablespoon balsamic vinegar
1 large sweet pepper, cored and thinly sliced
Salt and pepper to taste
1 lb ground chuck
1 teaspoon kosher salt
1/2 teaspoon ground black pepper
1 teaspoon paprika
1/2 teaspoon onion powder
4 slices pepper jack cheese
4 burger buns, toasted
4 large lettuce leaves
4-8 slices tomato

Instructions

Melt 1 tablespoon butter in a large skillet over medium-low heat. Add onions and stir occasionally until onions are a deep caramelized color, about 35-40 minutes.
Add garlic and cook 1 minute until fragrant. Pour balsamic vinegar into pan and deglaze, scraping up any browned bits. Place caramelized onions in a bowl and set aside.
Melt remaining 1 tablespoon butter in same skillet over medium-high heat. Add peppers to skillet and sauté 4-6 minutes until peppers are tender. Toss peppers into caramelized onion mixture and lightly season with salt and pepper.
Divide caramelized onion/pepper mixture in half. Place one of the portions on a cutting board and finely dice. Reserve other half on a small sheet of foil for topping on burgers later.
Place diced portion of caramelized onion/pepper mixture in a large bowl and add ground chuck, salt, pepper, paprika, and onion powder. Gently knead until meat is just combined then divide into 4 portions. Form each portion into a burger patty.
Preheat an outdoor grill to 400F or if cooking indoors, grease a large cast iron grill pan and heat over medium-high heat. Grill burgers flipping once until burgers reach your desired degree of doneness (see blog post for more info on this) Add cheese slices during last 1-2 minutes of cooking to melt on top of burgers.
Place reserved caramelized onion/peppers mixture on foil on grill and cook 2-3 minutes, tossing frequently until heated through.
Arrange lettuce leaves on bottom half of toasted buns. Top with burger patty, tomato slices, and reserved caramelized onion/peppers mixture. Top with top half of buns, serve burgers immediately, and enjoy!

Notes

Storing Instructions

Burgers are best if served immediately after assembly.

Nutrition