Beef Burgers with Whiskey Caramelized Onions and Blue Cheese

Name: Beef Burgers with Whiskey Caramelized Onions and Blue Cheese
Prep time: 15 min
Cook time: 35 min
Total time: 50 min
Yield: 4 servings
Cuisine: American
Ingredients: 1½ lb (680 g) ground beef, 80/20 blend; 1 tsp (6 g) kosher salt; ½ tsp (1 g) freshly ground black pepper; 2 whole (500 g) yellow onions, large, peeled, sliced into ½-inch rings; 2 tbsp (30 g) unsalted butter; ¼ cup (60 ml) whiskey or bourbon; ½ cup (120 ml) beef broth; 1 tbsp (12 g) brown sugar; 2 sprigs (3 g) fresh thyme; ¾ cup (180 g) crumbled blue cheese; 4 whole seeded rye buns; 8 leaves (80 g) leaf lettuce or butter lettuce, clean and dried (optional); 1 whole (200 g) tomato, large, sliced into ¼-inch rounds (optional)

From the MyKitchenBank Kitchen

Juicy grilled beef burgers topped with rich, deeply caramelized onions spiked with whiskey and creamy blue cheese. The sweet-savory-tangy combination elevates the classic burger into restaurant-worthy territory. These burgers are best served on seeded rye buns with crisp lettuce and tomato.

Prep: 15 min
Cook: 35 min
Wait: 10 min
Total: 1 hr
Makes: 4 burgers

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Steps

Before you start

Preheat your grill to medium-high heat (about 400°F / 200°C) for at least 10 minutes
Form burger patties and refrigerate them for at least 30 minutes before cooking
Have all toppings and condiments ready to assemble quickly
Keep a small spray bottle of water nearby to tame flare-ups on the grill

1
Start the caramelized onions
- In a large skillet over medium heat, melt the butter.
- Add the sliced onions and stir to coat evenly.
- Cook for 5 minutes, stirring occasionally, until the onions begin to soften and turn translucent.
- Do not rush this step—the goal is slow, gentle caramelization.
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Ready when: Onions are soft and translucent
Tip: Use a heavy-bottomed skillet to distribute heat evenly and prevent scorching
2
Deglaze with whiskey
- Increase the heat to medium-high and pour in the whiskey.
- Stir well to release any browned bits stuck to the pan bottom.
- Cook for 1–2 minutes, stirring, until most of the whiskey has evaporated and the alcohol smell is gone.
- The liquid should reduce by about half.
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Ready when: Whiskey has evaporated and smell of alcohol is no longer sharp
Tip: Be careful if using an open flame—the whiskey may briefly ignite, which is fine; let the flame die naturally
3
Finish caramelizing the onions
- Add the beef broth, brown sugar, and thyme sprigs.
- Reduce heat to medium-low and simmer, stirring occasionally, for 20–25 minutes.
- The onions should become soft, deeply golden brown, and the liquid should reduce to a glossy, syrupy consistency coating the onions.
- The broth should be nearly evaporated.
- Discard the thyme sprigs.
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Ready when: Onions are dark golden brown, soft, and syrupy liquid coats them; most liquid has evaporated
Tip: Stir every 5 minutes or so to ensure even cooking and prevent sticking on the bottom
4
Form the burger patties
- While the onions finish cooking, divide the ground beef into 4 equal portions of about 5.6 oz (170 g) each.
- Gently form each into a ¾-inch-thick patty about 4 inches (10 cm) in diameter.
- Do not overwork the meat—handle it just enough to shape it.
- Make a small indentation in the center of each patty with your thumb.
- Season both sides generously with salt and pepper.
- Place the patties on a plate and refrigerate until the grill is ready.
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Ready when: Patties are evenly shaped with a slight indentation in the center
Tip: The indentation prevents the burger from puffing up and becoming a ball while cooking. Do not press or flatten the patties on the grill—this squeezes out juices
5
Grill the burgersOven 400°F / 205°C
- Place the burger patties on the preheated grill and cook undisturbed for 3–4 minutes over medium-high heat (about 400°F / 200°C).
- You should hear a good sizzle.
- Do not move the patties; this allows a caramelized crust to form.
- Flip each burger only once and cook for another 2–3 minutes.
- For medium doneness, aim for an internal temperature of 160°F (71°C) measured with a meat thermometer inserted into the thickest part.
- The burger should feel slightly firm when pressed with your finger.
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Ready when: Internal temperature reaches 160°F (71°C); burger has a brown crust and feels slightly firm
Tip: Resist the urge to press down on the burgers with the spatula—this forces out the juices and makes the burger dry
6
Toast the buns and top with cheese
- In the last minute of cooking, place the rye buns cut-side down on the grill for 30–45 seconds, just until they are lightly toasted and have grill marks.
- Remove the burgers from the grill and immediately top each patty with 3 tablespoons (45 g) of crumbled blue cheese.
- The residual heat will slightly soften the cheese.
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Ready when: Buns are golden and toasted; blue cheese begins to soften from burger heat
Tip: Watch the buns carefully—they toast quickly and can burn in seconds
7
Assemble and serve
- Place the toasted bun bottoms on a serving platter or individual plates.
- Lay lettuce leaves on each bun bottom, then top with a blue cheese–topped burger patty.
- Spoon 3–4 tablespoons (40–50 g) of the whiskey caramelized onions over the blue cheese on each burger.
- Add a tomato slice if using.
- Cap with the toasted bun top and serve immediately while the burgers are still warm.
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Tip: Assemble the burgers just before serving so the buns stay crisp and the cheese is warm and softened

Good to know

Tips

Do not overwork the ground beef when forming patties. Overmixing develops gluten and makes the burgers dense and tough. Handle the meat just enough to shape it.
The 80/20 ground beef blend is essential—it has enough fat to stay juicy and flavorful while the burgers cook, but lean enough to not be greasy. Avoid very lean blends (90/10).
For perfect caramelization, resist the urge to stir the onions constantly. Let them sit and brown on the bottom for 2–3 minutes between stirs. This creates the deep color and complex flavor.
If your grill is not preheated to at least 400°F (200°C), the burgers will steam rather than sear. Use a grill thermometer to check, or hold your hand 2 inches above the grate—you should only be able to hold it there for 2–3 seconds.

Make ahead

The whiskey caramelized onions can be made up to 2 days ahead. Cool completely, cover, and refrigerate. Gently reheat in a skillet over medium-low heat, stirring occasionally, for 5–7 minutes until warmed through. Do not microwave, as this can make them watery. The burger patties can be formed, covered, and refrigerated for up to 8 hours before grilling.

Storage & reheating

Leftover burgers are best enjoyed immediately, but cooled components can be stored separately: whiskey caramelized onions in an airtight container in the refrigerator for up to 3 days; blue cheese crumbles in an airtight container for up to 1 week. Do not freeze assembled burgers, as the buns become soggy when thawed. To reheat, warm the onions gently in a skillet and toast the bun bottoms lightly before reassembling.

Substitutions

whiskey or bourbon → dry red wine or brandy. Use the same amount. The onions will have a slightly different but still delicious savory-sweet character. Cook off the alcohol in the same way.
crumbled blue cheese → sharp aged cheddar or Gruyère. Use the same amount. The burger becomes less tangy and more savory. Gruyère adds nuttiness.
seeded rye buns → brioche buns or whole wheat buns. Brioche adds sweetness; whole wheat adds earthiness and fiber. Both work, but the rye's slight sourness pairs best with the whiskey onions.
beef broth → beef stock or chicken broth. Either works equally well. Use the same amount. The onions will be slightly less rich with chicken broth.